Which equation shows the associative property of addition? A.-4(7+8)=-4x7(-4)x8

B.-7x(3x4)=(-7x3)x4

C.-8+(8+7)=(-8+8)+7

D.-3+(7+3)=-3+(3+7)

Answers

Answer 1

Answer: A is the answer for you

Answer 2

Answer: C.-8+(8+7)=(-8+8)+7.

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Please help
6x^2/7y*21yz/12xy

Answers

Answer: 3/2x^3y^3z

Answer:

Simplified, it equals (3x^3*y^3*z)/2

Step-by-step explanation:

K(n)=2n-2. find k(-4)

Answers

-10 is the answer
Plug in -4 for n so 2x-4-2=-10

The measure of one of the acute angles in a right triangle is 63.7º. what is the measure of the other acute angle? 26.3º 76.3º 116.3º 66.3º

Answers

the correct answer is a. 26.3

Two solutions of different concentrations of acid are mixed creating 40 mL of a solution that is 32% acid. One-quarter of the solution is made up of a 20% acid solution. The remaining three-quarters is made up of a solution of unknown concentration, c.Which equation can be used to determine c, the unknown concentration?

Answers

Taking the 3 solutions as 3 different terms, we can create an equation as follows:

Solution 1 : 10mL with 20% acid
Solution 2 : 30mL with x% acid
Solution 3 : 40mL with 32% acid

Since solution 1 + solution 2 = solution 3, let us substitute the given values we have:

10(0.2) + 30(x) = 40(0.32)
2 + 30x = 12.8

To solve for the unknown concentration x, we subtract 2 from both sides:
2 + 30x - 2 = 12.8 - 2
30x = 10.8

Dividing both sides by 30:
30x/30 = 10.8/30
x = 0.36

Therefore the unknown solution is 36% acid.

Answer:

Therefore the unknown solution is 36% acid.

Step-by-step explanation:

Select the items from the following list that are included in financial literacy.