10). (3 points) What is the length of one side of a square whose area is 81 square inches?

Side = __________

11). (3 points) The equation for the area of a circle is:

A = R R

Rewrite this equation using the square symbol.

A = _________________________

12). (3 points) The area of a square is .4096 square feet. What is the length of one of its sides?

Side = __________

13). (3 points) I am thinking of a number. If you square my number and then add 5 you get 54. What is my number?

Equation:_____________________

Answer:_______________

14). (3 points)[Extra Credit]
Do this on your calculator:
  1. Compute 4 - 8 (answer should be -4)
  2. Hit the "" key (takes square root of -4)
What happened?

Why?