If 40% of a radioactive substance remains after 20 years, what is the half-life of the substance?

Find the next three numbers of each number pattern 2,6,12,20

If I have $30 to spend, and a video game costs $25 plus 10% game tax. Would I have enough to buy it? (Statements are; A. You do not have enough to buy the game. B. You can buy the game and will get $2 in change. C.

A set of four stars form the shape of a rectangle in space. The length of the rectangle is approximately 2,290,000 miles, while the width of the rectangle is approximately 22,700,000 miles. What is the approximate area of the rectangle?

Which of the following equations correctly represents a circle centered at the origin with a radius of 5? A. x 2 + y 2 = 25 B. x 2 + y 2 = 5 C. (x - 5) 2 + y 2 = 25 D. (x - 5) 2 + (y - 5) 2 = 5

How do you solve systems of linear equations by graphing?

The smallest hummingbird is the Bee hummingbird. It has a mass of about 1 1 4 grams. The mass of a larger type of hummingbird is about 5 times the mass of the Bee hummingbird. What is the mass of the larger hummingbird?

How long would it take to travel 200 meters at 5 m/s

Type your answer in decimal form. Do not round. 7 days = a0 hours

If you multiply two decimals that are less than 1, can you predict whether the product will be less than or greater than either of the factors?

Jessie and Mia are playing the integer card game. The cards in Jessie's hand are 3, - 5, 9 and - 6. What is the total score of Jessie's hand?