A painter uses the formula C = 20h + 20c to determine how much he should charge a customer in dollars if a job takes h hours and c cans of paint. How much should the painter charge if it took 15 hours and 3 cans of paint to paint a house?

Exhibit.

If a person randomly selects a drink, what is the probability that it will be a type of milk?

In the diagram below, K is a point on line AD.

What is the measure, in degrees, of angle BKC?

Exhibit.

If bicyclist B were to travel at his same rate of speed for 10 hours, how many miles would he travel?

A point and its reflection in a line are mirror images of one another, the "mirror" being the line itself. In the diagram below, points P and Q are reflections of one another in the y-axis.

Point R (not shown) is the reflection of point P in the x-axis. Point S is the reflection of point R in the y-axis.
What is the location of point S?