Question

A deep-sea exploring ship is pulling up a diver at the rate of 25 feet per minute The diver is 200 feet below sea level. How deep was the diver 10 minutes ago?

Answer 1

Ten minutes ago, the diver was `450` feet below sea level.

Explanation:

Since tge diver is being pulled up, measuring his movement for the past `10` minutes requires that we use `-25` for the movement over those `10` minutes. So, his depth `10` minutes ago is given by the expression

`-200 - 25(10)`
`-200 - 250`
`-450`

So, `10` minutes ago, the diver was `450` feet below sea level.