Any numbers to the 2nd powered are always squared. Whenever you are given an exponent, the base is the number that you multiply, and the power is one more than how many times you multiply the base number together. In this case, you multiply five by itself once to get 25 as your answer.
This question is asking you to find the circumference of the circle. To do this the equation is C=D where C is circumference and D is diameter. So, C= 3.14* 2.5 which equals 7.85 ft.
