The formula for the area of a trapezold with altitude k and bases m and n is A=k/2(m+n) Solve for m.

Hence, option C is true.

Step-by-step explanation:

Given the expression

Solving for 'm'

Flip the equation

Expanding by applying the distributive law:

Add (-1)/2 × kn to both sides

simplify

Divide both sides by k/2

Therefore,

Hence, option C is true.

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step-by-step explanation:

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10