An electronics store sells an average of 60 entertainment systems per month at an average of $800 more than the cost price. For
every $20 increase in the selling price, the store sells one fewer
system.
a. What amount over the cost price will maximize revenue?
b. What is the maximum revenue?
C. How much more money will the store make over the next
year?

Data for the height of a model rocket launch in the air over time are shown in the table. darryl predicted that the height of the rocket at 8 seconds would be about 93 meters. did darryl make a good prediction? yes, the data are best modeled by a quadratic function. the value of the function at 8 seconds is about 93 meters. yes, the data are best modeled by a linear function. the first differences are constant, so about 93 meters at 8 seconds is reasonable. no, the data are exponential. a better prediction is 150 meters. no, the data are best modeled by a cubic function. a better prediction is 100 meters.