Question

Can anyone help me with this thanks!

Answer 1

54.6 inches

Explanation:

Let x be the height of Duc's brother.

If Duc is 39 inches tall, and he is 5/7 as tall as his brother, then we can express this relationship as:

`(5)/(7)x=39`

To find the height of Duc's brother, solve the equation for x.

Multiply both sides of the equation by 7:

`7\cdot(5)/(7)x=7\cdot39`

`5x=273`

Divide both sides of the equation by 5:

`(5x)/(5)=(273)/(5)`

`x=54.6`

Therefore, the height of Duc's brother is 54.6 inches.