Question

All i know is that the answer is not 9

Answer 1

`AC=10`

1) The first thing we need to do is to find x, using the Perimeter, i.e. the sum of the sides:

`\begin{gathered} x+1+2x+x+3=40 \\ \\ 4x+4=40 \\ \\ 4x+4-4=40-4 \\ \\ 4x=36 \\ \\ (4x)/(4)=(36)/(4) \\ \\ x=9 \end{gathered}`

2) Note that the question is what is the length of AC. So we can plug x=9 into the AC expression:

`\begin{gathered} AC=x+1 \\ \\ AC=9+1 \\ \\ AC=10 \end{gathered}`