1.	Business An analyst estimates that the computers his company just bought will depreciate at a rate of 25% per year. At this rate, approximately how long will it take a computer to depreciate to 30% of its original value?
		A.	3 years	B.	5 years
		C.	4 years	D.	10 years
		Hint
	2.	Radioactivity The half-life of uranium-232 is 72 years. Find the approximate value of k in the formula y = nekt for uranium-232. Assume t is in years.
		A.	-0.0024	B.	-0.0096
		C.	-0.0048	D.	0.0012
		Hint
	3.	Two cities have insect problems. The insects in City A increase exponentially according to the equation y = 120,000e0.04t. The insects in City B increase exponentially according to the equation y = 90,000e0.08t. In 15 years, which city will have more insects, and by approximately how much?
		A.	City A, by about 80,000	B.	City A, by about 30,000
		C.	City B, by about 30,000	D.	City B, by about 80,000
		Hint
	4.	Two cities have insect problems. The insects in City A increase exponentially according to the equation y = 120,000e0.04t. The insects in City B increase exponentially according to the equation y = 90,000e0.08t. When will the cities have an equal amount of insects?
		A.	at t = 3 years	B.	at t = 34.66 years
		C.	at t = 7.89 years	D.	at t = 7.19 years
		Hint
	5.	Suppose a new car loses value at 10% per year for the first 5 years. When should the owner sell it if they want to receive 75% of what they paid for it?
		A.	after 3 years	B.	after 2 years
		C.	after 2.5 years	D.	after 2.73 years
		Hint