If they are similar then that means that the lengths of the sides of the two shapes are in the same proportions:
24/16 = 26/x
Now if we cross multiply we get:
24x = 26*16
24x = 416
x = 416/24 = 52/3
5x+12 5/7=72 5/7
subtract 12 5/7 from each side
5x +12 5/7 - 12 5/7=72 5/7- 12 5/7
5x = 60
divide by 5 on each side
x = 60/5
x=12
The answer to your question is B
The answer for this problem would be -52 because when you do 58-6 it give you 52 so i tried -52+58 and what did it give me 6 so -52 is your answer hope that this helps and here is a tip: negative is the only way to go down in addtion just to let you know <span />