Find the following probability for the standard normal random variable z. Please help!!!

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x