Question

solve the following formula for b1
a=(b1+b2/2)h

Answer 1

ah=(b1+b2/2)
ah-b2/2=b1

Answer 2

This looks like the formula of a trapezoid but you need to remember that it's \(\frac{b1+b2}{2}\), what you typed makes it look like this: \(b1+\frac{b2}{2}\).

Answer 3

*a/h