An elevator car on the 6th floor of a building has a mass of 658 kg and its three passengers have a combined mass of 146 kg.  If the elevator and its passengers ride to the ground floor, 19.17 m below, find the change in gravitational potential energy of the car and its passengers. 

You MUST

 show

all work starting with the formula (and rearrangement if needed).  The formula must use symbols for formulas introduced

in the VVS course.  Next, you need to

show the substitution of values into the formula, then the calculated

answer.  Remember to include units and use correct significant digits in

your final answer.  Responses only showing the final answer will receive a

zero grade.