A school reporter surveyed a sample of sixth grade girls about their favorite Friday Night activities. Sixty-five percent, or 39 girls, selected going to the movies as their
favorite activity. How many giris did the reporter survey?

answer

explanation

the area of a circle is calculated using the formula

or

we can use any of the above formulae to calculate the required. preferably, let us use the latter since the diameter is

we substitute the diameter into the formula to get:

this is the exact value for the area of the circle.

the correct answer is a

answer:

c) the x-coordinate of the center of the circle increases by 3