Acontractor digs a hole for the basements of a new house that is 40 feet long and 10 1/2 feet deep. what is the width of the hole if 6,510 cubic feet of dirt are removed?
a.80 feet
b.81 1/4 feet
c.16 feet
d.15 1/2 feet

How to solve it and what thw answer is

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?