can you please check my work.

Question

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.

Answer 1

Math is good, but online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown.

Answer 2

u r right

Answer 3

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.

Answer 4

YOUR WRONG!!!!!!!!

Answer 5

??????????? I dont get it help me.

Answer 6

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

Answer 7

is the answer 51.9? Cause that's what I got.

Answer 8

where did you get 90?

Answer 9

wait so what is the answer

Answer 10

The answer is 8.7

Answer 11

IDK. I don't understand this.