An urn contains 15 numbered balls, of which 9 are red and 6 are white. A sample of 5 balls is to be selected. How many samples contain at least 4 red balls?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.

V=x^4-y^4 pick three expressions that can represent the three dimensions of the prism (each in meters)

The perimeter of the rectangle is 120 feet. if the length of the rectangle is ten feet more than the width ,what are the dimensions (length and width) of the rectangle?