Question

Please Help I Don't Understand

Answer 1

Let's see

`\\ \rm\Rrightarrow (8)/(10)=(72)/(x)`

`\\ \rm\Rrightarrow (4)/(5)=(72)/(x)`

`\\ \rm\Rrightarrow 4x=360`

`\\ \rm\Rrightarrow x=90`

Answer 2

90

Explanation:

The angles are on either side of the line are in proportion.

Hence,

⇒
`(10)/(8) = (x)/(72)`

⇒
`(5)/(4) = (x)/(72)`

⇒
`x = (5 * 72)/(4)`

⇒
`x = 5 * 18`

⇒ x = 90