How do solve this problem -45=28-13+10b

What is this equation in point-slope form?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

You are on a cycling trip around europe with friends. you check the weather forecast for the first week. these are the temperatures for the week. sun mon tues wed thurs fri sat 16°c 20°c 24°c 28°c 28°c 23°c 15°c what is the mean temperature forecast for the week?