Yes, that is correct. She made $3,000 in month one, and then as we go between month one to the end of month five, to the end of the fifth month, she has made a total of $19,000. Let's do another one of these. So here we're told the function K of t gives the amount of ketchup in kilograms produced in a sauce factory by time in hours on a given day. So this is really quantity as a function of time. It isn't rate. What does the definite integral from zero to four of K prime of t dt represent?