Ireally need with this problem! (problems b. and c.)

B.
Use rise over run to find the slope. Rise over run uses the following formula:



We have two known points in the graph: (0,0) and (10, -35). Plug the values into the equation:





The slope of the graph is -3.5. Including units, this would be -3.5 degrees per thousand feet.

c.
The question includes a starting point for the temperature and the change in thousands of feet. Since the change is 5500, we'll divide this by 1000 to get the x-value:





The starting temperature will be our y-int for our slope intercept equation:




Plug in your x value:



The temperature at the top of the mountain is 55.75 degrees.