A bag contains 120 marbles Some are red and the rest are black. There are 19 red marbles for every black marble. How many black marbles are in the bag?

The axis of symmetry for the graph of the function f(x)=1/4^2+bx +10 is x=6. what is the value of b?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.