Working together jack and bob can clean a place in 30

Question

1) Graph the function y = 4x/(x² - 4) by using six step procedure explained in page 321 of section 4.2.

2) Find all real solutions: -(y³ + 4y)/(y² - 9) = 4y

3) Solve the following rational inequalities:

a) (x² + 5x + 6)/(x² -1) > 0

b) (2x + 17)/(x + 1) > x +5

4) Working together Jack and Bob can clean a place in 30 minutes. On his own, Jack can clean this place in 50 minutes. How long does it take Bob to clean the same place on his own?

Needs to show all work