A radioactive material has a half-life of 12 years. If 250 grams of this material were present

to start, how much will remain in four years?

Which expression is equal to 15x - 6

What is the length of the radius of a circle whose area is 100 pie (3.14) ?

A customer is owed $30.00. how many different combinations of bills, using only five, ten, and twenty dollar bills, are possible to give the customer his or her change

Given: x - 5 > - 10. Choose the solution set.

Write 75 as the sum of powers of 8, using rational exponents. 8^? x 8^? x 8^? x 8^? = 75

On three examinations, Dana received scores of 84, 89, and 78. What score does Dana need on the fourth examination to raise his average to 85?

You have a Spanish meeting every forth day and a math club meeting every tenth day. Today you have both meetings. In how many days will you have both meetings on the same day again?

5.2 turned into a fraction in simplest form.

A certain laptop is really popular and sells for $199.99. Since sales are so good, the store raises the price by 13%. What is the cost of the laptop after the markup?

Which statement is correct? (2.06 times 10 Superscript negative 2 Baseline) (1.88 times 10 Superscript negative 1 Baseline) less-than StartFraction 7.69 times 10 Superscript negative 2 Baseline Over 2.