Here is the problem I am having trouble with:

Driving down a mountain, Tom finds that he has descended

in elevation by the time he is 3.25 mi horizontally away from the

mountain. Find the slope of his descent to the nearest hundredth.

I'm sure it's probably a simple problem to set up and solve, but I can't seem to figure it out. It doesn't help that I do these classes online and they don't supply us with the whole math book, only the chapters we are working out of. More often than not, we come across problems that we have can't find the formula for. Our text books are very vague. I appreciate any help on this. I just need to know how to set it up and what steps to take in solving it. I will do the work myself.

Thank you,

Julie