1.
Which equation represents exponential decay?
A.
y
= 2.62(1.22)
x
B.
y
= 1.7(1.06)
x
C.
y
= 1.05(0.95)
x
D.
y
= 0.86(1.46)
x
Hint
2.
The Mendoza family just bought a house for $180,000. If the value of the house increases at a rate of 3% per year, about how much will it be worth in 10 years?
A.
$242,000
B.
$234,000
C.
$250,000
D.
$258,000
Hint
3.
If a $5000 piece of equipment looses value at a rate of 5% per year, how much will it be worth after 5 years?
A.
$4011.62
B.
$3868.90
C.
$6381.41
D.
$4279.35
Hint
4.
Ricky invested $1000 in an account at 8% interest compounded quarterly. How much money will he have earned on the account after 7 years?
A.
$1,741.02
B.
$741.02
C.
$1,713.82
D.
$713.82
Hint
5.
Suppose Tyler sprayed around the house for ants. Which formula would be used to find the number of ants still alive after a certain time if the number of ants was changing exponentially?
A.
compound interest
B.
cannot be determined from given information
C.
exponential decay
D.
exponential growth
Hint