Carter has $45.75. He wants to buy some model cars that cost $5.48 a piece. Does he have enough money to buy 8 cars? Explain.

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

What is the location of maximum over the interval [-3,1.5] for the graphed function?