An isotope's radioactivity declines at a rate of 17% for 15 years. If it's initial radioactivity was 1000 rotengens, how much radioactivity is left?

Jessica is a custodian at oracle arena.she waxes 20 m2 of the floor in 3/5 of an hour. jessica waxes the floor at a constant rate.at this rate how many sqaures meters can she wax per hour

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Set up and solve a proportion for the following application problem. if 55 pounds of grass seed cover 404 square feet, how many pounds are needed for 7272 square feet?