Y = -9x - 10 The dolphin is diving 9 feet per second so the rate of change is -9. It's also 10 feet below sea level which makes the y-intercept -10 Hope this helped!
I don't think all of the answer choices are here since they are all the same except for 4. However, the best statement to describe a polygon is that it is a closed plane figure with three or more sides that are straight. The correct answer is A.
