Asked by sara7

can you please check my work.
A scientist uses a submarine to study ocean life.
She begins at sea level, which is at an elevation of 0 ft.
she travels straight down at a speed of 3.5ft per second.
she then travels directly up 30seconds at a speed of 2.2ft per second.
1) after 120 seconds, what is the scientist's elevation?

I multiplied 90x3.5=315 ft, then I mult. 30x2.2=66
then I subtracted 315-66=249ft down.

2)If the submarine travels at a maximum speed of 5 feet per second, how long would it take to return to sea level? round to the nearest second.
I took the answer from the first part 249 ft and divided it by 5 = 49.8 so I made it 50 seconds.

Are these correct? Thanks for looking over my work.
Answered by PsyDAG
Math is good, but online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown.
Answered by Anonymous
u r right
Answered by Anonymous (1)
I don't think you are exactly correct. You aren't supposed to round 4.8 seconds to 5 seconds, and it says "round your answer to the nearest tenth of a second" You rounded the quotient of 249/4.8 to the nearest number in the ones place instead.
Answered by anonymous
YOUR WRONG!!!!!!!!
Answered by anonymous
??????????? I dont get it help me.
Answered by Nya_babygirl
You are smart. You were able to further understand your answer. I love how you gave steps. And allow us to understnd good job bro or sis
Answered by Anonymous
is the answer 51.9? Cause that's what I got.
Answered by Anonymous
where did you get 90?
Answered by Anonymous
wait so what is the answer
Answered by Renee
The answer is 8.7
Answered by Anonymous
IDK. I don't understand this.
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