We expect to see a line for a graph of a composition of a function and it's inverse function, if the domain of each is all numbers.
a.) real
b.) negative
c.) positive
d.) commutative

What is the volume of the sphere shown below with a radius of 3?

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

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.