Question

I need to show my work so please be descriptive, thanks!​

Answer 1

see explanation

Explanation:

Using the proportionality theorem

(a)

`(3x-5)/(10)` =
`(20)/(8)` ( cross- multiply )

8(3x - 5) = 200 ← distribute left side

24x - 40 = 200 ( add 40 to both sides )

24x = 240 ( divide both sides by 24 )

x = 10

(b)

3x - 5 = (3 × 10) - 5 = 30 - 5 = 25

Hence

Perimeter = 10 + 25 + 28 + 16 = 79