There are three black marbles and four red marbles in a bag, what is the probability that you will pick a black marble out of the bag?

Write the linear inequality shown in the graph. the gray area represents the shaded region. y> -3y+5 y> 3x-5 y< -3x+5 y< 3x-5

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25