200 people were asked if they like any of running, cycling or swimming. Of these people,
8 like running, swimming and cycling
16 like running and swimming but not cycling
33 do not like any of these activities
28 like cycling and swimming
all 40 people who like cycling like at least one other activity
124 like running
One of the people asked is chosen at random.
Given that this person likes swimming, find the probability that this person likes cycling.

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.