Let f be the function that determines the area of a circle (in square cm) that has a radius of r cm. That is, f(r) represents the area of a circle (in square cm) that has a radius of r cm.

Use function notation to respond to each item below.

Represent the area (in square cm) of a circle that has a radius of 4.5 cm.

Represent how much a circle's area (in square cm) increases when the circle's radius increases from 10.6 to 10.61 cm.

Represent the total area of 5 circles, each of which has a radius of 12.6 cm.

A circle has a radius of 23 cm. A second circle has an area that is 54 square cm greater than the first circle's area. Represent the area of the second circle