Answer:
x = 27
Step-by-step explanation:
similar triangles
26/18 = 39/x
x = 39(18/26)
x = 27
could also use
39/x = (39 + 26) / (x + 18)
to get to the same result
39(x + 18) = x(39 + 26)
39x + 702 = 39x + 26x
702 = 26x
x = 27
or
18/x = 26/39
x = 18(39/26)
x = 27
