At a sale carnival, Encik Rosli chooses a T-shirt from a rack which displays tag as shown in Diagram 20. The original price of the T-shirt is RM85. When Encik Rosli scans the price tag of the shirt, the scanner shows that the price is RM57.80. Determine whether this percentage discount corresponds to the percentage discount displayed. Give a reason for your answer.

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.

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.