Question

Given the formula A=1/2(a+b)h, find the value of a when b = 13, h = 9, A = 90.​

Answer 1

Answer:

a=7

Step-by-step explanation:

given b=13

h=9

A=90

substitute these values in given formula

A =1/2(a+b)h

90=1/2(a+13)9

2*90=(a+13)9

180=9a+117

180-117=9a

63=9a

63/9=a

7=a