Question

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

Answer 1

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`:

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