In a given amount of time, Mary drove twice as far as Lynn. Altogether they drove 60 miles. How far did Mary drive?
A. 20 miles
B. 30 miles
C. 40 miles
D. 45 miles

Select the graph of the solution. click until the correct graph appears. |x| = 3

Jose is going to use a random number generator 500500 times. each time he uses it, he will get a 1, 2, 3,1,2,3, or 44.

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.