Question

A=1/2h(a+b) for a
Not sure what to do here​

Answer 1

a = (2A)/h - b

Explanation:

A=1/2h(a+b) for a

Multiply both sides by 2:

2A=h(a+b)

Divide both sides by h:

(2A)/h = a + b

Subtract b from both sides:

(2A)/h - b = a

Switch sides:

a = (2A)/h - b