Question

Another submarine’s descent can be represented as y = -240x, where y is the elevation and x is time in hours. How many hours will it take this submarine to make the descent to the seafloor 2,100 feet below the surface?

Answer 1

SOLUTION

A submarine’s descent can be represented as y = -240x, where y is the elevation and x is time in hours.

TO DETERMINE

The time it will take this submarine to make the descent to the seafloor 2,100 feet below the surface

EVALUATION

Here it is given that A submarine’s descent can be represented as y = -240x, where y is the elevation and x is time in hours

Now we have to find the time it will take this submarine to make the descent to the seafloor 2,100 feet below the surface

Since the submarine to make the descent to the seafloor 2,100 feet below the surface

So y = - 2100

So y = - 240x gives

- 2100 = - 240x

$\displaystyle \sf{ \implies x = \frac{ - 2100}{ - 240} }$

$\displaystyle \sf{ \implies x = 8.75 }$

FINAL ANSWER

The required time

= 8.75 hours

= 8 hours 45 minutes

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Answer 2

Solution

A submarine’s descent can be represented as y = -240x, where y is the elevation and x is time in hours.

TO DETERMINE

The time it will take this submarine to make the descent to the seafloor 2,100 feet below the surface

EVALUATION

Here it is given that A submarine’s descent can be represented as y = -240x, where y is the elevation and x is time in hours

Now we have to find the time it will take this submarine to make the descent to the seafloor 2,100 feet below the surface

Since the submarine to make the descent to the seafloor 2,100 feet below the surface

So y = - 2100

So y = - 240x gives

- 2100 = - 240x

⟹x= −2100/−240

⟹x=8.75

FINAL ANSWER

The required time

= 8.75 hours

= 8 hours 45 minutes