Question

help please I need help

Answer 1

Explanation:

This is a ratio problem using triangles. 8 and x are part of the smallest triangle at the top. The next triangle down has a side length of 8 + 9 which is 17, and the other side length of x + 12. So we proportion the problem like that:

`(8)/(x) =(17)/(12+x)`

Then cross multiply to get

8(12 + x) = 17x and

96 + 8x = 17x and

96 = 9x so

x = 10.666666

or 10.7

The last choice in the list.