Charlie has 6 times as many stamps as Ryan. They have 1608 stamps in all. How many more does Charlie have than Ryan?

A card is chosen at random from a deck of 52 cards. What is the probability that a heart or spade is chosen?

In a sample of 200 observations, there were 80 positive outcomes. Find the standard error for the sample proportion.

Let n = 5. What is the value of the expression 9n^2 - 2-n?

What are two inequalities for "at least 100"?

Which is an irrational number?

What are the zeros of x (squared) + 2x + 3 in imaginary form

2 quarters, 1 dime, 2 nickles, and 3 pennies ... what fraction of the coins were either nickles or pennies?

A customer went to a garden shop and bought some potting soil for 12.50 and 5 shrubs. The total bill was 62.50. Write and solve and equation to find the price of each shrub

Find the ratio of m to n. 4n = 2m

Each week he swims a total of 7000 meters. How many kilometers does he swim each week?