Suppose a jar contains 7 red marbles and 21 blue marbles. if you reach in the jar and pull out 2 marbles at random at the same time, find the probability that both are red.

Write a 3 digit number that has a 4 that is 10 times the value of the 4 in 843

A rectangle has a height of X and a width of 7x - 4. Express the area of the entire rectangle. Expression should be expanded. 72

A store has 18 red beach balls and 17 green beach balls in boxes of 5 beach balls each how many boxes of beach Balls are in store?

In a single elimination tournament half of the remaining teams are eliminated in each round. If the tournament starts eith 128 teams how many teams will be after 5 rounds

The value of/[/left (1-{1/over3} / right) / left (1-{1/over4} / right) / left (1-{1/over5} / right) ... / left (1-{1/over n} / right) / ]is equal to?

What is 8.49x10^-7 in decimal form? 0.0000000849 0.000000849 8,490,000 849,000,000

Travel Ez sells dollars at a rate of ($1.40) / (1 euro) and buys dollars at a rate of ($1.80) / (1 euro). At the beginning of a trip, Sophie exchanged $540 to get 300 euros.

What is the range of y = square root x+7+5?

Is to a solution of the equation 3x+6=6x?

What would - 9 1/2 be as a decimal?