Principal Simons purchases boxes of pens for her school at an online store. The store charges her the same amount for each box of pens plus a flat shipping fee for any number of boxes she purchases. Selected numbers of boxes and the corresponding total cost including the shipping fee for that number of boxes are shown in the table. Let t be a function that models the total cost including the shipping fee, in dollars, to purchase p boxes of pens. Based on the values in the table, which of the following best defines the function t?
Boxes of pens Amount of money it costs
Plug in the data to see which equation works
example 5 boxes = 20.40
5* (3.6) = 18 18 does not = 20.40 so second equation is NOT the answer.....try the others to find the correct one
always a good idea to try one of the other data sets when you think you have the right eqution as a check