In order to find the missing values in the table, let's use the following exponential model:

Now, to find the values of a and b, let's use the ordered pairs (0, 3) and (1, 15) from the table:

Therefore the equation is y = 3 * 5^x.
Now, using x = -1 and x = 3, we have:

Therefore question 5 is equal to 3/5 and question 6 is equal to 375.