A wallet containing 5 five-dollar bills, 7 ten-dollar bills, and 8 twenty-dollar bills is found and returned to its owner. The wallet's owner will reward the finder with 1 bill drawn randomly from the wallet.
What is the probability that the bill drawn will be a twenty-dollar bill?

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The diagram above shows the breakdown by age of the 1,560 people who attended the Spring Island Concert last weekend.
How many people between the ages of 18 and 34 attended the concert?

The sum of 2 positive numbers is 151. The lesser number is 19 more than the square root of the greater number.
What is the value of the greater number minus the lesser number?

The expression 9 × ( x - 3) + 2 × (4 x + 4) is equivalent to:

If b3 = -64, then b 2 - 3b - 4 =: