A square has an area of 64 square feet. What is the length of each side of the square?

Correct me if I'm wrong but my answer is:
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Step-by-step explanation:

No you are correct. That's the correct end result. Technically you should start with

Area = s^2

Area = 64 ft^2

s^2 = 64

sqrt(s^2) = sqrt(64)

s = 8

s = - 8 has no meaning.

Your way is fine.

< 4, -5>

step-by-step explanation:

starting from g. we move 4 right and then 5 down to get to h. that means the vector is < 4, -5>

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80