Question

Find the value of x to the nearest tenth.
Answer options: 8.9, 7.5, 8.1, 7.9

Answer 1

8.9

Explanation:

apply pythagorean relationship

a²+b²=c²

where a=? b=4 and c=6

hence c²-b²=a²

6²-4²=a²

36-16=a²

√20=a

a=√20

but x= 2a

x=2 × √20

x=8.944 ⇒8.9 to the nearest tenth