Steve's mom gave him $20.00 on monday morning to use on lunches. at his school, the school lunch costs $1.75, which he bought monday through thursday. on friday, he decided to buy 2 slices of pizza instead of buying the school lunch. if the pizza costs $1.40 per slice, then how much of the money is left at the end of the school week?

Two parallel lines are crossed by a transversal. what is the value of x? x = 40 x = 70 x = 110 x = 130

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

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.