Answer:
AC = 56
Explanation:
Um, so basically the answer is given to you, no work required. The problem states that the two lines are equal, so AC must equal 56 as well. :P
But let's solve it anyway:
5x + 1 = 56
5x = 56 - 1
5x = 55
x = 11
AC = 5(11) + 1
AC = 55 + 1
AC = 56
-Chetan K