Answer:
7ft 8in is left over
Step-by-step explanation:
What do you mean doubling? You can add 7+7+7 which equals 21.
We want to find the product:

.
By the

, we distribute

over each of the three terms inside the parenthesis:

.
Multiplying the coefficients, and adding the exponents we get:

.
Answer:

.
It is 6 to the 8th power (8 is in the box)
Answer:
88
Step-by-step explanation:
You are just adding 82+6=88