Step-by-step explanation:

Answer:
AB is parallel to BE because it is an equilateral triangle.
BE is parallel to EC because it has 2 of the same angles to the same sides are equal.
Hope that helps, it's a tad hard to explain
Answer:
Multiplication
Step-by-step explanation:
Follow PEMDAS, so first you would sub in the 5 then work in the parentheses so you would multiply the 5