What quadratic function has a maximum of (2, -8)

Data was collected on myrtle beach for 11 consecutive days. each day the temperature and number of visitors was noted. the scatter plot below represents this data. how many people visited the beach when the temperature was 84 degrees?

What is the slope of the line that contains the points (-2,1) and (0,-3)

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)