A bag contains 7 red marbles and 10 blue marbles. What is the probability of randomly selecting a red marble from the bag?

Simplify (8x2 − 1 + 2x3) − (7x3 − 3x2 + 1). −5x3 + 11x2 − 2 5x3 − 11x2 + 2 x3 + 2x2 + x3 x3 − 2x2 − x3

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale

Arectangular courtyard is 12 feet long and 8 feet wide. a tile is 2 feet long and 2 feet wide. how many tiles are needed to cover the courtyard?