How do you solve for b1

a=1/2h(b1+b2)

Since b1 stand for base 1 you should find the base and plug in the numbers there’s parentheses so you solve this first so you’d solve _+_=_ usually theres a line going straight with a number around it that’s gonna be your height and your other 2 are the bases

0<0

Step-by-step explanation:

divide both sides by 4 and it leaves you with 0 on both sides.