23
select the correct answer
jeff is playing a racing game. the game awards him an initial $4,000 of virtual money. in addition, he gets $100 of virtual money for each race he
wins. in the end, he calculates average earnings of $200 for each race he won. if i represents the number of races he won, which equation can
be used to find the number of wins?
a
4,000 + 2005
- 100
4,000 + 1001
= 200
c4,000 + 100 = 100
= 4,000
d.
200 + 100r

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.