1. Which is a true statement about two numerical sets of
data that have negative association?
A. As one variable increases, the other variable does not
change.
B. As one variable increases, the other variable increases.
C. As one variable decreases, the other variable decrease
D.) As one variable increases, the other variable decrease

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.