Answer:
1) 3(12-1)
2) 33
Step-by-step explanation:
times means multiplication and difference of means subtraction
you do first because of the parenthesis 21-1 equals 11
and then multiply 11 by 3 which is 33
So for this, you'll be using the pythagorean theorem to solve for the height.

Solve the exponents to get

Subtract 81 on each side to get

Square root each side, and your answer should be

or 13.23 ft
I think the answer is -0.29 because u have to group on the left and add the 8.5 to the right ☺️