Math help pls!! answer choices are 17.1 , 3.5 , 8.4 , and 1.5

Question

asked Jan 21, 2021 231k views

1 Answer

Aliweb · Answer 1 · 2021-01-28T00:58:21+0000

Triangles ABD and BCD are similar, because they are both right and share a common angle, and thus all three angles are equal.

This means that we can set the proportion

AB/ AD = BC/ DC

Plug the numbers and we have

5/ 3.5 = 12/ x

Solve for
:

$x=(12\cdot 3.5)/(5)=8.4$