Plz I need help in Khan Academy Raj wants to take yoga classes. There are two yoga studios that have different membership plans.
The first studio charges a fixed amount of \$70$70dollar sign, 70 per month, and you can take as many classes as you want for no additional charge.
The second studio charges a smaller initial fee plus an additional fee for each class taken. The monthly price (in dollars) of the second studio as a function of the number of classes taken is given by the following table of values:

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.