dennis and aldris go to the movie theater and purchase refreshments for their friends dennis spends a total of $18.25 on two bags of popcorn and three drinks. aldris spends $27.50 on 4 bags of popcorn and two drinks write a system equation that can be used to find the price of one popcorn and one drink

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.