Question

he formula for a trapezoid relates the area A, the two bases, a and b, and the height, h.

A=(a+b)2h

Solve for a.

a=2Ah−b

a=2A−bh

a=2Ah+b

a=Ah2−b

Answer 1

First you switch sides (a+b)/2 h=A
Then  Multiply the fractions h(a+b)/2 =4
Multiply both sides by 2  2h (a+b/2 =2a
Simplfy h(a+b) = 2a 
Divide both sides by h 
simplfy
Subtract b form both sides 
your answer a=bh−h+2

Answer 2

that an option

Answer 3

it's C

Answer 4

ok