Answer:

Step-by-step explanation:
Let x be the number of minutes she can continue, since she's already 20 feet below the ocean surface and is diving at the rate of 20 ft/minute, her depth with respect to x would be
20 + 20x
But she doesn't want to reach more than 100 feet below the surface

Sorry I can't find the answer but find other users sorry
Answer: 20. 4, 3, 2, 1...
21. 17....
Step-by-step explanation:
Ay^2+2ay-3a
a(y^2+2y-3)
a(y-1)(y+3)