Answer:
B. DE = 58
Explanation:
If you dont understand here is a simpler way to think of it -
Option C- x = 8 we now know that x = 8
now FE=58 we must solve the problem ?
So (6x+ 10) since "x" = 8 the answer is going to look a bit like this
6x8+10= ? now 6 x 8 is ... 48 just add the 10 and BOOM 58 is your answer.
now sometimes depending on the shape and instructions on how to find the answer may differ this is one of the most common ways when it comes to shapes such as Squares, Triangles , Rectangles , Hexagons ... ETC .