Question

Suppose a submarine is 480 feet below sea level. The submarine rises 40 feet per minute. Write an integer to express the time it takes to reach the surface.

Answer 1

B is the correct option

Step-by-step explanation:

i got it right on edge

Answer 2

12 minutes.

Step-by-step explanation:

Let x represent number of minutes.

We have been given that the submarine rises 40 feet per minute. So rise in elevation of submarine in x minutes would be
`40x`.

We are also told that the submarine is 480 feet below sea level. This means that initial position on y-intercept is
`-480`.

Submarine's final elevation after x minutes would be
`40x-480`.

The submarine will reach on the surface, when final elevation of submarine is equal to 0.

`40x-480=0`

`40x-480+480=0+480`

`40x=480`

`(40x)/(40)=(480)/(40)`

`x=12`

Therefore, it will take 12 minutes for the submarine to reach the surface.