In country x, the average yearly salary of 50-year-olds with 16 years of education is $50,275, while the average yearly salary of 50-year-olds with 12 years of education is $36,265. according to this data, four additional years of education are likely to be correlated with higher future wages of about:
a. 24 percent.
b. 38 percent.
c. 50 percent.
d. 88 percent.

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.