At the farmer's market, there is a scale that measures the weight of fruit and vegetables. the needle is 16 cm long, and it rotated 68° when danielle placed six oranges on it. how far did the needle travel as it rotated?
272 pi over 45
45 pi over 272
1088π
544π

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.