The half-life of a certain radioactive element is 200 years. How will it take for a 100 pound chunk of this element to decay to a chunk that is 50 pounds?

Write an equation for each problem. Six less than 3 times a number is 12 less than twice the number.

Select the correct answer. Solve the following equation for 80x2 + 92x - 84 = 0

Factor completely : (x^2+x-6) (2x^2+4x)

prime number is only divisible by 1 and itself ... No other whole numbers can multiply together to make 11. 15 is not a prime number because the factors of 15 are 1, 3, 5 and15 (). 15 has more than 2 factors, so it is not a prime number.

What is ... $500 decreased by 10%

What is one half of 5/8

Determine how far the vehicle travels in 3 hours. A motorcycle travels 25 miles every 0.5 hour. The vehicle travels miles.

It takes a baseball player 16 seconds to round the bases and make it back to home plate home plate if it is 360 feet to go all around the bases then calculate the players average speed

Bruce and Mila are collecting baseball cards from their favorite teams, the Orioles and the Pirates. The equation r+p=28 represents the number of cards Bruce has. The equation 2r+p=43 represents the number of cards Mila has.

Kyra has a manufacturer's coupon for $5 off a box of diapers and a store coupon for 20% off any purchase. The store will let you use both coupons, but it does not have a policy about which coupon you must use first.