MATHEMATICS MIDDLE SCHOOL

4/2 =
what is the answer

Answers

Answer 1
Answer: 4 divided by 2 is equal to 2.
Answer 2
Answer: Hi Gracek0911, the answer to 4/2 is 2

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She has a half a pound of sugar and her cabinet her cake recipe calls for two tenths of a pound of sugar how many cakes can she make

Answers

She will probably make a small cake because , she needs 2 10ths of a pound of sugar , she only has a half , so a half of 1 , so she will make a very small cake

9x + 7y = -12 find the value of y when x equals 1

Answers

Answer:

y = -3

Step-by-step explanation:

9x + 7y = -12

Let x = 1

9 (1) + 7y = -12

9  + 7y = -12

Subtract 9 from each side

9 -9 + 7y = -12-9

7y = -21

Divide each side by 7

7y/7 = -21/7

y = -3

Answer:

y = -3

Step-by-step explanation:

9x + 7y = -12

9(1) + 7y = -12

9 + 7y = -12

7y = -12 - 9

7y = -21 (divide both sides by 7)

y = -3

Electrons and protons are particles in an atom with equal but opposite charges. Electrons have a negative charge and protons have a positive charge. What is the charge amount of an atom with 2 more electrons than protons?

Answers

Answer:

-3.2\cdot 10^(-19)C

Step-by-step explanation:

- Protons are positively charged particles contained in the nucleus of the atom. They have a charge of q_p=+1.6\cdot 10^(-19)C

- Electrons are negatively charged particles orbiting around the nucleus of the atom. They have a charge of  q_e = -1.6\cdot 10^(-19)C

For a neutral atom, the number of protons is equal to the number of electrons, so the total charge of a neutral atom is:

Q=Nq_p + Nq_e = N(q_p+q_e)=N(+1.6\cdot 10^(-19)-1.6\cdot 10^(-19))=0

In this problem, we have an atom having an excess of 2 electrons, i.e. it has 2 more electrons than protons.

Therefore, the charge of this atom will be:

Q=0+2q_e

and substittuing, we find

Q=2(-1.6\cdot 10^(-19))=-3.2\cdot 10^(-19)C

Select the graph for the solution of the open sentence. Click until the correct graph appears. |x| > 4

Answers

Answer:

***********o                                                         o**************

<----------(-4)--------(-2)--------(0)--------(-2)----------(4)-------------->

x>4 or x<-4

Step-by-step explanation:

You are looking for numbers that give you a distance, x, greater than 4 from 0. That wouldn't be anything between -4 and 4 because these would all give you a distance less than 4 from 0. So the answer would be to shade everything greater than 4 while also shading everything less than -4.

Here is a number line <-----|-----|-----|-----|-----|-----|-----|-----|-->

                                          -6    -4   -2    0     2     4    6    8

                                                 

Let's think about this more which of these numbers on this number line would satisfy |x|>4?

Numbers inside the numbers -4 and 4.

Or the numbers on the outside.

Let's try the inside numbers:

-2,02

|-2|>4

 2>4 is false which means -2 doesn't satisfy |x|>4

|0|>4

 0>4 is false which means 0 doesn't satisfy  |x|>4

|2|>4

 2>4 is false which means 2 doesn't satisfy  |x|>4

We could also try -4 and 4... but these will both give you a distance equal to 4 from 0.  And we are looking for greater than.

|-4|>4

 4>4 is false which mean -4 doesn't satisfy |x|>4

|4|>4

 4>4  is false which means 4 doesn't satisfy |x|>4

Now let's try the numbers on the outside:

-6,6,8

|-6|>4

 6>4 is true so -6 does satisfy |x|>4

|6|>4

 6>4 is true so 6 does satisfy |x|>4

|8|>4

 8>4 is true so 8 does satisfy |x|>4

So what I'm trying to do is convince you more that the only numbers that would satisfy |x|>4 are numbers outside the interval from -4 to 4.

So x>4 or x<-4.

On a number line the solution would look like this:

***********o                                                         o**************

<----------(-4)--------(-2)--------(0)--------(-2)----------(4)-------------->

We have holes at -4 and 4 to mean we do not include those numbers.  We would have if the inequality read |x| \ge 4.  The line underneath this inequality means to include or equals.  We do not want to include; we did not have the equal sign.   The only difference between the two solutions would be to fill the holes if you |x| \ge 4.

***********o                                                         o**************

<----------(-4)--------(-2)--------(0)--------(-2)----------(4)-------------->

A cone has a radius of 6 inches and a height of 20 inches. What is the exact volume of the cone?Question options:

240 π in3


120 π in3


80 π in3


720 π in3

Answers

It would be A, but it ultimately matters what formula you are using.

Which of the following situations can be modeled by the equation n+0.50n-0.3n =1.2n, where n is the # of nickels originally in the jar?a. Amanda takes out 50% of the nickels in the jar on Friday and adds a number of nickels that is equal to 30% of the remaining number of nickels in the jar on Monday. There are 20% fewer nickels in the jar after Monday than before Friday.

b. Amanda takes out 50% of the nickels in the jar on Friday and adds a number of nickels that is equal to 30% of the original number of nickels in the jar on Monday. There are 20% fewer nickels in the jar after Monday than before Friday.

c. Amanda adds 50% of the original number of nickels to the jar on Friday. The number of nickels Amanda takes out on Monday is equal to 30% of the new number of nickels. There are 20% more nickels in the jar after Monday than before Friday.

d. Amanda adds 50% of the original number of nickels to the jar on Friday. The number of nickels Amanda takes out on Monday is equal to 30% of the original number of nickels. There are 20% more nickels in the jar after Monday than before Friday.

Answers

C. because n would equal 1 then add 50% or .5 then take 30% or.3 equaling 1.2
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