What's the radius of a circle with an area of 16π ft2

r= 4 ft

Step-by-step explanation:

The area of a circle is given by

A = pi r^2

We know the area is

16 pi = pi r^2

Divide each side by pi

16 pi/pi = pi r^2/pi

16 = r^2

Take the square root of each side

sqrt(16) = sqrt(r^2)

4 =r

(1) You would need to print 500 pages

(2) To print 500 pages from home would cost $125

Step-by-step explanation: The cost of printing at home has been given as a fixed cost of 100 plus an additional variable cost of 0.05 per page for ink, that is, Cost = 100 + 0.05p. Also, to print at the office, the cost has been given as 0.25 per page, that is, Cost = 0.25p.

Therefore for the costs to be the same, we need to equate both cost functions (that is, C = C) as follows;

100 + 0.05p = 0.25p

Collect like terms and we now have,

100 = 0.25p - 0.05p

100 = 0.20p

Divide both sides of the equation by 0.2

500 = p

To print 500 pages at home therefore would cost,

C = 100 + 0.05p

C = 100 + 0.05(500)

C = 100 + 25

C = 125

Therefore to print 500 pages from home would cost $125