Given 1x)= 10-2x, find f(7).

-4
3
7
56

I'm confused on this could anyone me and show me what i need to do to solve it.

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.