What is the answer to x-y=6
to x=6+y

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

Factor these polynomials and explain how 1. 12x - 3x^2 2. 20 - 240x^2