A consumers group is concerned with the mean cost of dining in a particular restaurant. A random sample of 40 charges (in dollars) per person has a mean charge of $39.7188 with standard deviation of $3.5476. Is there sufficient evidence to conclude that the mean cost per person exceeds $38.00

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.

Segment ab is shown on the graph. which shows how to find the x-coordinate of the point that will divide ab into a 2: 3 ratio using the formula

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase