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

Answer:

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.

$40x-480=0$

$40x-480+480=0+480$

$40x=480$

$\frac{40x}{40}=\frac{480}{40}$

$x=12$

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

Answer 2

Answer:

B is the correct option

explanation:

i got it right on edge