To begin with a bacteria study, a petri dish had 2000 bacteria cells. each hour since, the number of cells has increased by 8.5%. let t be the number of hours since and y be the bacteria cells write an exponential function showing the relationship between y and t

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.