I think you have a typo in the formula . . .
I need to find the average and instantaneous rate of change of a rational function:
As you get farther from Earth’s surface, gravity has less effect on you.
For this reason, you actually weigh less at higher altitudes.
A person who weighs 55 kg can use the function: .
to find their weight, W in kgs, at a specific height, h in feet above sea level, above the Earth’s surface.
(a) Find the average rate of change from heights of 750 ft to 1200 ft above sea level.
(b) Find the instantaneous rate of change at 1200 ft above sea level.
Now try it . . .