Question

A= 1/3 (a + b) h

Please answer ASAP!!! ☺️

Answer 1

times both sides by 3/1
3A=(a+b)h
distribute
3A=ah+bh
minus ah from both sides
3A-ah=bh
divide both sides by h
$\frac{3A-ah}{h}=b$
$b=\frac{3A-ah}{h}$
or
$b=\frac{3A}{h}-a$