Angel signed up for a streaming music service that costs $11 per month. The service allows Angel to listen to unlimited music, but if he wants to download
songs for offline listening, the service charges $0.50 per song. How much
total money would Angel have to pay in a month in which he downloaded 25
songs? How much would he have to pay if he downloaded s songs?
Cost for 25 songs:
Cost for s songs:

Is a positive integer raised to a negative power always positive

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

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.