You are a restaurant manager and are responsible for ordering ingredients for the restaurant at supplier number one you can purchase 20 gallons of milk for $70 at supplier number two you can purchase 50 quarts of milk for $33.50 at supplier number three you can purchase 15 gallons for $48.75 and receive a course free which is the best deal

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.