The slope means the depth per second
121/100 is the answer. it cant be simplified anymore
First, you factor and simplify (respectively) the numerator and denominator. Your equation becomes:

Notice, there is a (x + 7) on both the top and the bottom. Because of this, they cancel each other out. What is left is your answer:
Solve (2x - 1)(3x^2 - 9x - 4)
=