What is the value of s+t-u if s= 12,t=8,and u=20

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?

Match the one-to-one functions with the graphs of their inverse functions.