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.
4 years
B.
3 years
C.
10 years
D.
5 years
Hint
2.
Radioactivity
The half-life of uranium-232 is 72 years. Find the approximate value of
k
in the formula
y
=
ne
kt
for uranium-232. Assume
t
is in years.
A.
-0.0096
B.
-0.0024
C.
0.0012
D.
-0.0048
Hint
3.
A Mickey Mantle rookie card appreciates in value 2% every year. If it is worth $35,000 in 2000, when will it be worth $100,000?
A.
2043
B.
2053
C.
2093
D.
2065
Hint
4.
Two cities have insect problems. The insects in City A increase exponentially according to the equation
y
= 120,000
e
0.04
t
. The insects in City B increase exponentially according to the equation
y
= 90,000
e
0.08
t
. When will the cities have an equal amount of insects?
A.
at
t
= 34.66 years
B.
at
t
= 3 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 2 years
B.
after 2.73 years
C.
after 3 years
D.
after 2.5 years
Hint