Question

Write an algebraic expression that represents the perimeter of the figure shown. (simplify your answer, type an expression using "b" as the variable)

Answer 1

An equilateral triangle is a triangle in which all three sides are equal and a square has equal sides 

The base of that triangle is "7b" so:

Perimeter: the border or outer boundary of a two-dimensional figure. it means that the perimeter of the figure is the orange lines

7b + 7b + 7b + 7b + 7b + 7b = 42b