Emilio owns a bakery. the number of boxes of cookies he has left on a monday is represented by the function x + y = 42, where y is the number
of boxes of cookies remaining in the bakery and x is the number of hours since he opened the bakery. how many boxes did he have at the start
of business on monday? (note: x20, y0, and y takes only integer values.)

Point r divides in the ratio 1 : 3. if the x-coordinate of r is -1 and the x-coordinate of p is -3, what is the x-coordinate of q? a. b. 3 c. 5 d. 6 e. -9

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.

Solve for the equation. 4x - 13 = 2x + 9