The profit when selling ‘x’ pairs of shoes is defined by the function p(x)=-4x^2+32x-39 How many pairs of shoes should be sold in order to maximize the profit? A: 6 pairs
B:7 pairs
C:4 pairs
D: 5 pairs

What is the product of the radical expression. (7-2square root) (8+2 square root)

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?