2,000 pounds of sand is used to fill sandboxes. 500 pounds can
fill the big sandbox, and the rest
Scan fill 5 equal-sized smaller
sandboxes. How much sand can
be put in each of the smaller
sandboxes?

What is the expression in factored form? -20x^2 - 12x a. 4x(5x+3) b. -4x(5x-3) c. -4(5x+3) d. -4x(5x+3)

With finding limits of multi variable !

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.