Question

Confused.

Answer 1

use similarity to find AC

Answer 2

AC= 16.8 ?

Answer 3

3.8/5.6 = 11.4/x

Cross Multiplication= 16.8

Answer 4

Notice that your unknown is QC, not AC. If you call QC x, then
the proportion you need is:
3.8/5.6 = 7.6/x

Answer 5

The way you did it, you got AC = 16.8, which is correct but is not what you are being asked. To finish, you must do:
QC = AC - AQ
QC = 16.8 - 5.6 = 11.2

Answer 6

woops ... sorry, I lost track of it ... that's how you do it.

Answer 7

Oh....I thought they were asking for PQ! Thank you anyway