The number of pounds of dog food that a pet store has is represented by the equation y = -15x + 430, where x represents the number of days that the store is open and y represents the pounds of dog food in stock in the store. how many pounds of dog food will the pet store have after 21 days?

Asphere has a diameter of 10 in. what is the volume of the sphere?

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2