Sam has $19 to buy snacks for 8 people in his office. Each person will get one snack. Sam is buying bags of chips that cost $2 per bag and bags of pretzels that cost $2.50 per bag.
Write a system of equations that can be used to find the value of x bags of chips and y bags of
pretzels.
How many bags of chips does Sam buy?

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.