How many valence electrons does Sodium (atomic #11) have? (1 pt)
*
1 point
1
7
8
11

Answers

Answer 1
Sodium has one valence electron. The answer would be one.

Related Questions

A cup of gold colored metal beads was measured to have a
mass 425 grams. By water displacement, the volume of the
beads was calculated to be 47.5mL. Given the densities listed in

Answers

The density of the gold colored metal beads if mass is 425 g and volume of 47.5mL is 8.9 g/mL.

What is density?

Density is defined as the ratio of the Mass of the substance to the volume of the substance.

It's SI unit is kg/m3.

It is denoted by ρ or rho.

Density = mass/volume

From the given data, we noticed that,

Mass of gold colored metal beads = 425g

Volume of the gold colored metal beads = 47.5mL.

By substituting all the value, we get

= 425/47.5

= 8.9

Thus, we concluded that the density of the gold colored metal beads if mass is 425 g and volume of 47.5mL is 8.9 g/mL.

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what safety rule does not apply to the organic chemistry laboratory? no eating, drinking, or smoking in the laboratory. wear proper clothing at all times. wear enclosed safety goggles at all times while in the laboratory. follow all safety instructions in the laboratory text or given by the teaching assistant. none of the choices are correct.

Answers

Safety rules are the regulatory actions that need to be followed to prevent any danger. Following all safety instructions in laboratory text or by assistant does not apply in an organic chemistry lab. Thus, option D is correct.

What are laboratory safety rules?

Laboratory safety rules are the guidelines that are supposed to be followed by the person working in the laboratory while performing the experiments. While working in the organic chemistry lab one should never remove the equipment.

One should wear safety goggles and should not perform the experiments in absence of a teaching assistant. But it is not necessary to follow all the rules in the laboratory textbook.

Therefore, in option D. all rules of the information textbook are not necessary to be followed.

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Which of the following is TRUE about
scientific laws?
states that something will happen
universally observable
attempts to explain why something
happens in nature
a statement or equation that reliably
predicts patterns or events

Answers

Answer:

c

Explanation:

As we know science is all about fact so from many years scientist use to predict the future or events so answer is in my opinion c

Draw the conjugate acid for the following base (lone pairs do not have to be drawn):

Answers

move double bond add line pairs to Oxygen and make negative then move a double bond into the hexagon

do elements in your body occur as free elements?

Answers

Answer: The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you. They are found throughout your body, mostly as water but also as components of biomolecules such as proteins, fats, DNA and carbohydrates.

Explanation:

HELP ME THIS IS MY FINAL QUESTION
All of the following are procedures used to reduce the amount of acid rain in the environment except...

Select one:
a. requiring that catalytic converters be installed on new automobiles.
b. installing scrubbers in smokestacks.
c. separating sulfur from coal before it is burned.
d. using leaded gasoline in automobiles.

Answers

All of the given procedures are used to reduce the amount of acid rain in the environment except using leaded gasoline in automobiles; option D.

What is acid rain?

Acid rain refers to the condition in which oxide gases of non-metals released from combustion of fossil fuels dissolve in rain water to form acids which is then called acid rain.

Acid rain is mainly formed when sulfur oxides and nitrogen oxides released  from combustion of fuels dissolve in rainwater.

Acid rain results in polluted water an also affects the organisms found in the environment.

Some  procedures used to reduce the amount of acid rain in the environment include:

requiring that catalytic converters be installed on new automobiles.installing scrubbers in smokestacks - scrubbers remove harmful particles and gases from industrial exhaust smokeseparating sulfur from coal before it is burned to prevent formation of sulfur oxide

Therefore, using leaded gasoline in automobiles will not reduce the amount of acid rain in the environment.

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Which compounds in biochemistry contain nitrogen? (Will give brainliest)

Answers

Answer:

Amino acids, nucleic acids, and nucleobases are key biological nitrogen compounds.

Explanation:

Answer:

amines and amides

Explanation:

If we are talking organic/biochemistry only I would say amines and amides

Chemical
Part I: The Big Picture
1. When we look at the periodic table of elements, why do we not see substances such as
water listed there?
use
they

Answers

Answer:

Water is H2O which is a compound and would therefore not be on the periodic table. The periodic table only consists of elements.

3. Kristen was arrested for stealing 6.532 tons of gold from the armory in North Carolina.
She escaped capture for 2.45 days; until she was picked up on the side of the road for
jaywalking. At this time, she had had already hid some of the gold, but had 2.34 tons of
gold still with her. The gold with her was confiscated by police. a) How much money did
she make from the gold? b) How much room/volume does the gold take up?
a)

Answers

1,63760 money she make from the gold and volume of gold take 5.295 volume is the amount of space occupied by a substance

Here given data is kristen was arrested for stealing 6.532 tons and then She escaped capture for 2.45 days and then she had already hid some of the gold, but had 2.34 tons of gold still with her

We have to find how much money did she have if 2.34 tons of gold still with her = ? and how volume does gold take up = ?

Volume is the amount of 3D space a substance or object occupies

We have to convert 2.34 tons into money

Then  2.34 tons =  1,63760 money

And the formula to find volume is:

volume = mass/density

Mass of gold = 196.96 and density = 18.31

Volume = mass of gold / density

Volume = 196.96 / 18.31

Volume = 5.295

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If you have any two gases in different containers that are the same size at the same pressure and same temperature, what is true about the moles of each gas?.

Answers

When gases in two different containers are same , at same temperature, and same pressure then the number of moles must also be same.

Why the number of moles are same?See we know then if the gases with same temperature and pressure have the same number of mole then it clearly means that their volume is not same.And when we add two different gases in a same container it also turned out to be a solution because it is then a homogenous mixture.It all depends on how much amount of gas you are adding in a given container , it can be a great amount and small amount .But no matter of amount , if you add it and the amount increases then volume will definitely increase and vice-versa.

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If I have 3.40 moles of gas at a pressure of 1.20 atm, a volume of 31.00 liters, what
temperature is the gas?

Answers

The temperature of the gas is 133.42 kelvin.

Assuming that the gas in the question is ideal, we can apply the ideal gas equation which is as follows:

PV = nRT

Here P is the pressure of the gas = 1.20 atm

V is the volume of the gas = 31.00 liters

N is the number of moles = 3.40 moles

R is the universal gas constant = 0.0821 L atm

T is the temperature of the gas =?

Putting the values in the above equation:

1.20 x 31.00 = 3.40 x 0.0821 x T

T = 1.20 x 31/3.40 x 0.0821

T = 133.42 K

Thus, the temperature of the gas is 133.42 kelvin.

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Cellular respiration transforms glucose and oxygen into carbon dioxide, water, and energy. c6h12o6 6o2 → 6co2 ?h2o energy based on the law of conservation of matter, what is the missing coefficient for water?

Answers

On the basis of the law of conservation of matter, the missing coefficient for water is 6 in the process of cellular respiration. Thus, the correct option is 1.

What is cellular respiration?

It is possible to define cellular respiration as a chemical process that results in the breakdown of food inside the cell and the release of ATP, which is a type of energy.

It entails the chain of chemical processes through which organic materials are oxidized to provide energy to living things.

The left side of the equation has 6 molecules. The equation must be balanced so it must be 6 for the coefficient of water.

C₆H₁₂O₆

Thus, the correct option is 1. six, 6.

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The question is incomplete. Your most probably complete question is given below:

1. 6

2. 8

3. 4

4. 2

Sourav was heating oil to fry potato chips. The cooking oil all of a sudden caught fire. He took water to pour on the fire to extinguish it. But meanwhile his mother came and switched off the gas and covered the wok completely with a plate.
• Do you think pouring water to the burning oil would have worked? Why?
• Do you think what Sourav’s mother had done is right? Why?
• Can you suggest other ways in which we can stop fire due to burning
oil?
• What values of Sourav and Sourav’s mother are shown here?

Answers

Answers

Pouring water on an oil fire will not work, it will spread the oil and spread the fire because oil and water do not mix. It could also splash the hot oil onto Sourav and burn him.

Sourav’s mother did the right thing.
By turning off the gas she eliminated the heat source. By covering the wok she eliminated oxygen that the fire requires to burn. Covering the wok also prevented the fire from spreading.

Another way to stop the fire would be a kitchen fire extinguisher which would put the fire out quickly. If you don’t have an extinguisher, you can pour salt on a small fire to smother it, or pour baking soda on it (not baking powder) chemically extinguishes it.

The values shown are a son helping his mother in the kitchen and his mother showing him a science lesson of how to properly extinguish an oil fire

if only 0.264 g of ca(oh)2 dissolves in enough water to give 0.178 l of aqueous solution at a given temperature, what is the ksp value for calcium hydroxide at this temperature?

Answers

The ksp value for calcium hydroxide at this temperature is 5.20 × 10⁻⁶.

What is ksp?

Ksp is an equilibrium constant of a solid substance dissolved in a liquid solution.

Given that, the volume of water is 0.178 l, 0.264 g of Ca(OH)² dissolves in enough water

The solution equilibrium is

Ca(OH)² = Ca + 2OH

The molar solubility is

0.186 / 74.00  / 0.230 = 0.0109 M

The ksp value will be

Ksp = (s) (2S)²

Putting the values in the formula

(0.0109) x (2 x 0.0109)² = 5.20 × 10⁻⁶.

Thus, the ksp value for calcium hydroxide is 5.20 × 10⁻⁶.

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Glassware that allows a solution to be precisely and slowly added to another solution.

Answers

A glassware that allows a solution to be precisely and slowly added to another solution is a Burette.

Burette, a laboratory apparatus used in quantitative chemical analysis to measure the volume of a liquid or a gas. It consists of a graduated glass tube with a stopcock (turning plug, or spigot) at one end. The tube of the burette is filled with a fluid, such as water, oil, or mercury.

Burette is also used in Titration. It is a process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them.

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what is the symbol for the element with an electron configuration of 1s^22s^22p^31s 2 2s 2 2p 3 1, s, squared, 2, s, squared, 2, p, cubed?

Answers

The correct answer is Nitrogen.

From the given question the electronic configuration of the element is given as:

1s²2s²2p³

hence, we know that the maximum no of electrons in the sub-shell

s= 2

p=6

while in this p has only 6 electrons.

Thus by counting the number of electrons in each sub-shell we can know the atomic number as several electrons in an atom is equal to the atomic number of the atom.

thus, the no of electrons present is- 2+2+3= 7

For, 7 electrons the element present will be nitrogen with atomic number 7.

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A sample of hydrogen gas, H₂, has a volume of 5.86 L at a temperature of 273K and a pressure of 1.5 atm. Calculate the number of moles of H₂ present in this gas sample. Assume that gas behaves ideally.
a
5.86 mol
b
0.57 mol
c
0 mol
d
0.39 mol

Answers

The option (d) will be correct, that is the answer would be 0.39 mol.

Ideal gas equation is also known by the  name of the general gas equation.

It is already mentioned in the problem,

Volume , V = 5.86 L

Temperature , T = 273 K

Pressure, P = 1.5 atm

Ideal Gas Equation : PV = nRT

n = PV / RT

= 1.5  atm * 5.86 L / 0.0821 L atm mol^-1 K^-1 * 273 K

=  8.79 / 22.41 mol

=0.39 mol

Hence the number of moles of H2 found in the gas sample is 0.39 mol.

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An oxide of iron is found to be 70. 00% iron by mass. Determine the empirical formula for this compound and name it.

Answers

The empirical formula of iron oxide is Fe2O3 and its name is ferric oxide.

Given:

Percentage of iron by mass = 70%Molar mass of iron = 55.85Percentage of oxygen by mass =30 %Molar mass of oxygen =16

Solution:

Now, calculate the relative mass of iron in iron oxide = Percentage of iron by mass / At. mass of iron

Relative mass of iron = 70/55.85 = 1.25

Relative mass of oxygen = Percentage of oxygen by mass / At. mass of iron = 30/55.85 = 1.88

Now the calculate the molar ratio of iron to oxygen = 1.25 : 1.88 = 2:3

Thus, the empirical formula of iron oxide is Fe2O3 and its name is ferric oxide.

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polar attractions are ... polar attractions are ... (a) forces between atoms with partial charges. (b) weaker than covalent bonds. (c) important because they are numerous. (a) and (b) are true. (c) is false. (a), (b), and (c) are correct. submit

Answers

polar attractions are ... polar attractions are  (a), (b), and (c) are correct.

Briefing :

Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells.

What are polar attraction ?

Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells. can happen inside a water molecule and can develop between H and N.

We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can pull or pull away from one another (opposite charges attract, alike charges repel).

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Can someone please help me write a poem about scientific law vs scientific theory?

Answers

You can include that a law describes what and a theory explains why. You could also say that a theory could become a law.

A compound has an empirical formula BH3 and a molar mass of 27.6 g/mol. What is the molecular formula of the
compound?

Answers

The molecular formula of the compound having an empirical formula BH₃ and a molar mass of 27.6 g/mol is B₂H₆.

Empirical formula is the whole number ratio of the atoms which are present in the compound.

Molecular formula is the number of atoms of each element present in one molecule of compound.

Given -

Empirical formula = BH₃

Molar mass = 27.6 g/mol

We must find the empirical mass of the compound,

Molar mass of B = 10.8 amu

Molar mass of H = 1.00  amu

Therefore,

Empirical mass = 10.8 amu + (3 x 1.00) amu = 13.8 amu

To find molecular formula, we divide the molecular mass by the empirical mass. So,

Molecular formula = Molecular mass

                                  Empirical mass

Molecular formula = 27.6

                                  13.8

Molecular formula = 2

Hence, the molecular formula of the compound is BH₃ = B₁ₓ₂H₃ₓ₂ = B₂H₆

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a chemist must prepare of aqueous aluminum sulfate working solution. she'll do this by pouring out some aqueous aluminum sulfate stock solution into a graduated cylinder and diluting it with distilled water. calculate the volume in of the aluminum sulfate stock solution that the chemist should pour out. round your answer to significant digits.

Answers

The aluminum sulfate stock solution should the chemist pour out is 219.8 ml

Complete Question

A chemist must prepare 400 mL of 1.00M aqueous aluminum sulfate working solution. He'll do this by pouring out 1.82 mol/L aqueous aluminum sulfate stock solution into a graduated cylinder and diluting it with distilled water. How many mL of the aluminum sulfate stock solution should the chemist pour out?

The aluminum sulfate stock solution should the chemist pour out is 219.8 ml

Given:

V1 = 400ml, M1 = 1 M, V2 = ?, M2 = 1.82 M

Hence, the relation between molarity and volume is as follows.

M1V1 = M2V2

1.00M x 400ml = 1.82 x V2

V₂ = 219.8 ml

Thus, we can conclude that 219.8 ml of the aluminum sulfate stock solution should the chemist pour out.

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3 of 103 of 10 Items
25:14










Question
Choose the words or phrases that apply to this scenario.

Several experiments in the 1800s demonstrated that the tips of plants are responsible for detecting light, which causes the stem of the plant to elongate and bend towards the light.
Which of these phrases are accurate about the experimental design and its validity? (Choose 3)
A The light levels should increase during the experiment as the plant grows.The light levels should increase during the experiment as the plant grows.
B All species of plants behave the same way.All species of plants behave the same way.
C The experiment should be repeatable by the same researcher.The experiment should be repeatable by the same researcher.
D A control plant with no light or top light would likely show no bending.A control plant with no light or top light would likely show no bending.
E The experiment should be replicated by different researchers.

Answers

The accurate phrases abut the study design and validity are:

All species of plants behave the same way A control plant with no light or top light would likely show no bending.The experiment should be replicated by different researchers.

What is the role of light in the growth of plants?

The role of light in the growth of plants is important as light is necessary for photosynthesis.

The growth regions of a plant are the shoots and the roots.

The shoots of plants show positive phototaxis by growing towards a unidirectional light source.

A unidirectional light source is light that comes from one direction.

The growth region of the shoot, that is the tips produces hormones which enable the tip of the plant to grow towards the light source.

Considering the given experiment , the accurate phrases abut the study design and validity are:

All species of plants behave the same way A control plant with no light or top light would likely show no bending.The experiment should be replicated by different researchers.

In conclusion, the experiment to demonstrate the bending of plants shoots towards a light source should include a control and must be repeated by other researchers,

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HELP MEEEEEE
Which of the following is an example of a neutralization reaction?
A) 2 H2O (I) --> 2 H2 (g) + O2 (g)
B) 2 Na(s) + H2SO4 --> NaSO4 + H2(g)
C) CO2(g) + H2O --> H2CO3
D) HCI + KOH --> KCI + H2O

Select one:
a. A
b. B
c. C
d. D

Answers

Answer:

D) HCl + KOH --> KCl + H2O is the answer

what is a wire guage use for in chemis
try​

Answers

Answer:

Hello How are you

Explanation: the answer might be Screenshot

Answer: Wire gauze is an essential piece of supporting equipment in a laboratory as glassware cannot be heated directly with the flame of a Bunsen burner, and requires the use of wire gauze to diffuse the heat, helping to protect the glassware.

Explanation:

solve this problem. a sample of liquid aluminum with mass of 4.39g. the density of liquid aluminum is 2.7 g/cm3. what is the volume of this sample?*1 point

Answers

The more the volume of the substance less dense will be the substance. The sample of liquid aluminum with a density of 2.7 g/cm³ has a volume of 1.62 cm³.

What is the relation between volume and density?

The volume has been the space that is in inverse relation to the density of the substance and gets increased with less dense substances while decreasing with more dense substances.

Given,

Mass of aluminum = 4.39 gm

Density of aluminium = 2.7 g/cm³

The volume of Al is calculated as:

Volume = Mass ÷ Density

V = 4.39 ÷ 2.7

= 1.62 cm³

Therefore, the volume of liquid aluminum is 1.62 cm³.

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My pen weighs 24.08grams and when dropped in a graduated cylinder of water that has initial volume of 43mL and final volume 56mL . What is the density of the pen?

Make sure you write you answer with proper sig figs. Density = mass/volume

Answers

Taking into account the definition of density, the density of the pen is 1.8523 g/mL.

Definition of density

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume.

Density of the pen

In this case, you know that:

Mass of the pen= 24.08 gInitial volume= 43 mLFinal volume= 56 mLVolume of the pen= Final volume - Initial volume= 56 mL - 43 mL= 13 mL

Replacing in the definition of density:

density= mass of the pen÷ volume of the pen

density= 24.08 g÷ 13 mL

Solving:

density= 1.8523 g/mL

In summary, the density of the pen is 1.8523 g/mL.

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4. Calculate the density of helium from the fact that a balloon with capacity of 5.00
L holds 0.890 g.

Answers

The ratio of the mass in grams and volume in cubic meters gives the density. The density of 0.80 gm helium is 1.78 × 10 ⁻⁴ g/cm³.

Helium (He) is an inert gas and a chemical element belonging to Periodic Table Group 18 (noble gases). Helium, the second-lightest element (only hydrogen is lighter), is an odourless, tasteless gas that melts at a temperature of 268.9 °C (452 °F).

Helium has lower freezing and boiling points than any other known substance. The only element that cannot solidify by adequate cooling at standard atmospheric pressure is helium; in order to solidify it, pressure of 25 atmospheres at a temperature of 1 K (or 272 °C or 458 °F) must be applied. density (0 °C, 1 atm): 0.1785 grammes per litre

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What charge will elements in group 2 (also identified as IIA) typically have when forming ionic compounds? Example: Magnesium (Mg, #12) (1 pt)
*
1 point
+1
+2
-1
-2

Answers

Elements in group 2 have a charge of +2 while forming ionic compounds.

While forming ionic compounds , elements of group 2 loose 2 electrons from their valence shell as a result of which charge of +2 is generated on them as electrons are negatively charged.

How does charge vary in the periodic table?

As like all the other periodic trends, charge also varies across the periodic table. On moving down the group, as  number of valence electrons do not change as a result of which charge too does not change along a group.

But, while moving across a period as electrons are added to the same shell the number of valence electrons no longer remains same rather it increases and so does the charge.

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(help please 20 points!!)
Explain why mass is used to measure the properties of solids, liquids, and gases.

Mass takes into account the force of gravity.
Mass is a measure of weight that stays constant.
Mass is a measure of matter that does not change.
Mass and gravity are both necessary for accurate measurements.

Answers

Mass is an extensive property of a matter which describes the number of particles in a matter. According to the law of conservation of mass "mass can neither be created nor be destroyed." Hence mass is a quantity which never changes whether a particle is in a solid, liquid or gaseous state.

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what describes the business need (the problem the project will solve) and the justification, requirements, and current boundaries for the project? multiple choice question. project scope project management project plan project manager swansea manufacturing currently produces 3,000 tires per month. the following per unit data for 3,000 tires apply for sales to regular customers: direct materials $38 direct manufacturing labor 14 variable manufacturing overhead 19 fixed manufacturing overhead 20 total manufacturing costs $91 the plant has capacity for 5,000 tires and is considering expanding production to 4,000 tires. what is the total cost of producing 4,000 tires? What is a simple definition for stubborn? Your own words Economist hernando de soto believes that the benefits of capitalism will not be achieved until. Write the expression (-7) x (-7) x 5 x 5 x 5 x 5 using exponents The problem-solving plan identifies the letter W as "What do you need to do to solve the problem?" Which of the following answer choices are included in the problem solving plan for the letter W? A. Solve the problem and change your strategy if necessary. B. Did you check the answer and did you answer the question asked. C. Read the problem carefully, find the question, understand the problem and find out what you know. D. Organize the problem and find the question. 6. Which is the best buy for a box of oat cereal? a. 10 ounces for $2.69 b. 12 ounces for $3.18 c. 16 ounces for $4.08 d. 24 ounces for $5.88 express the limit as a definite integral on the given interval. lim n[infinity] n xi ln(1 xi2) x, [2, 6] i Which skill in the science process contains the units,number, and conversion? tabitha was a bit offended by the way the man on the street treated her; he spoke to her as though she did not understand life as well as he did. Fill in the missing levels of organization in living things from smallest to largest: cell, __________, organ, _______________, organism an audit team generally includes blank . multiple select question. an it analyst one or two seniors staff members a financial analyst a partner a manager Round 3.691 or the nearest hundredth an outline for an essay should not include the following? a. two to four main supporting ideas b. two to four topic sentences THIS IS FOR ALEGBRA 2 AND NO TUTOR CAN HELP ME I NEED HELP PLEASE The circumference of a circle is 14 in. What is the area, in square inches? 2. Complete the following sentences following the rules of subject-verb-agreement. [5] a. Not only the students but also their instructor______ been called to the principal's office. i. were ii. have iv. are iii.. has b. No news____good news. i. are iii. have c. Ten pounds_____a reasonable price for this computer. i. seem iii. d. The poor____honest i. are ii. is iii. has iv. had e. The memoranda_________ signed. i. were iii. is seems good news. ii. is iv, were a reasonable price for this computer. ii. were iv. are honest. ii. is iv. had ii. has been iv. was questions: what were the major features of the civilizations of the minoans and mycenaeans, and how did they create a foundation for classical greece? discuss the organization of the athenian political system. was it a democracy? in what ways is athenian democracy similar to american democracy? in what ways is it different? course hero ProblemTapiwa raked 5%, percent more leaves than Adam raked. Tapiwa raked 357liters of leaves.How many liters of leaves did Adam rake? There are 8 guests at lincoln's party. if each guest will be served exactly 1/4 pint of ice cream, how many pints of ice cream will he need? express your answer in simplest form.