Looking for tutors that are experts in slope of a curve.

Hello tutors. Can you give 2 example word problems or examples with answer and solution about negative slope and 2 example word problems or examples with answer and solution about positive slope? I have been trying to search on the concept of slope of zero but I cannot find anything about it, and I wanna review it through trying word problems or example.

I just need 2 examples each with complete solution/detailed explanation. Please. Thank you!