Question

Aresearch ship lowers a probe into the ocean to explore an underwater trench. The probe starts on a crane 16 feet above the surface and is lowered at a rate of 9.8 feet per minute. Write an expression for the depth of the probe after m minutes. What is the depth of the probe after 90 minutes? of the probe after m minutes​

Answer 1

The probe starts at 16 feet above sea level then it is lowered 9.8 feet per minute.

Start at 16 and then subtract 9.8 times the number of minutes:

Depth = 16 - 9.8m

Now to find the depth after 90 minutes replace m with 90 and solve:

Depth = 16-9.8(90)

Depth = 16 - 882

Depth = -866 feet