Ellie wants to rewrite the expression (a2)2 ∙ (a3)2 as a single exponent of the form an. she claims that n = 36 because 22 · 32 = 4 · 9 = 36. decide if ellie is correct. if she is correct, enter 36 below. if she is not correct, enter the correct value of n.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

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.