Question

1) A submarine is 84 feet below the surface of the water and descends 10 feet deeper every minute. How many minutes will it take for the submarine to be located 219 feet below the surface? Write and solve an equation.

Answer 1

The equation for this question is

84 + 10x = 219

The number of minutes it'll take the submarine to reach 219 feet is 13.5 minutes

Step-by-step explanation

Let the number of minutes it will take the submarine to reach 219 feet below the surface be x minutes.

The number of feet the submarine reaches in x minutes = (10x) feet

Since the submarine started from 84 feet, in x minutes, it would have reached a depth of

(84 + 10x) feet

This is equal to 219 feet

84 + 10x = 219

Subtract 84 from both sides

84 + 10x - 84 = 219 - 84

10x = 135

Divide both sides by 10

(10x/10) = (135/10)

x = 13.5 minutes

Hope this Helps!!!