Find real numbers a, b, and c so that the graph of the function y=ax^2+bx+c contains the points (-1,3), (3,8), and (0,2).

If eh = hg and hg=16, find the diameter of k

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Hi, can anyone show me how to do this problem? 100 points for this. in advance