When constructing the Hoover Dam concrete owed out of a cement mixer at a constant rate of change of 88 tons per 5 minutes. Let t represents the varying number of minutes elapsed since 12:00 am. a.) As the number of minutes since 12:00am changes from 1' = 47 tot = 80, what is the corresponding change in the number of tons of concrete produced? (You may use a calculator for this. Put in the exact number)