A set of pens sells for $6.25 and costs $3.50 to make. Forty-two percent of the profit (the difference between the purchase price and the amount it costs to make) from each set of pencils goes to a school. If 520 sets are sold, what is the amount of money that will go to the school? $

Find the roots of the equation below. x^2 - 6 + 9 = 0

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%

Solve the equation using the zero-product property. -3n(7n - 5) = 0 a. 0, -5/7 b. -1/3, -5/7 c. -1/3, 5/7 d. 0, 5/7