She went 3.5 feet per second down for 90 seconds
3.5*90 = 315 feet below
2.2*30 = 66 feet up
315-66 = 249 feet below.
So, she must go up at 4.8 feet per second.
249/4.8 = 51.875 seconds
52 seconds when rounded
Answer:
300,000,000 + 9,000,000 + 90,000 + 9,000 + 900 + 90.
Step-by-step explanation:
Hi there!
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I believe your answer is:
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Here’s why:

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Hope this helps you. I apologize if it’s incorrect.