Question 492245
First. since the dolphin is diving (that's below sea-level) the number of feet here will be a negative number.
Let's see how far below sea-level the dolphin will have travelled below the surface in 3.5 seconds at the rate of 3 feet per second.
(3 ft./sec)(3.5 secs) = 10.5 feet. But of course, this is a negative number so the answer would be: -10.5