A coin contains 9 grams of nickel and 16 grams of copper, for a total weight of 25 grams. What percent of the metal in the coin is copper?

Phyllis and chen are saving money to go to a football game. each friend starts with some money and saves a specific amount each week. phyllis made a graph to show the total she has saved at the end of each week. chen wrote an equation to show the total, y, he has saved at the end of each week, x. y = 15x + 15 compare the amount that each friend has when both friends start saving. select the correct answer from the drop-down menu to complete the statement. phyllis starts with $ and chen starts with $

Select the quadratic that has root x = 8 and x = -5

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.