Exponential Functions Questionnaire

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Question 9
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50/1 pt 52 99 0 Details
A radioactive substance decays exponentially. A scientist
begins with 140 milligrams of a radioactive substance. After
28 hours, 70 mg of the substance remains. How many
milligrams will remain after 43 hours?
mg
Give your answer accurate to at least one decimal place
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Question 8
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50/1 pt 52 99 0 Details
the points ( – 1, )
(
Find a formula for the exponential function passing through
3
and (1,12)
f(x) =
=
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Question 11
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A car was valued at $45,000 in the year 1991. The value
depreciated to $15,000 by the year 2000.
A) What was the annual rate of change between 1991 and
2000?
Round the rate of decrease to 4 decimal places.
r =
B) What is the correct answer to part A written in
percentage form?
%.
r =
C) Assume that the car value continues to drop by the same
percentage. What will the value be in the year 2003 ?
value = $
Round to the nearest 50 dollars.
=
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Question 10
く
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50/1 pt 52 99 0 Details
A house was valued at $95,000 in the year 1994. The value
appreciated to $165,000 by the year 2005.
A) What was the annual growth rate between 1994 and
2005?
Round the growth rate to 4 decimal places.
r =
B) What is the correct answer to part A written in
percentage form?
%.
r =
C) Assume that the house value continues to grow by the
same percentage. What will the value equal in the year
2009 ?
value = $
Round to the nearest thousand dollars.
=
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Question 12
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50/1 pt 52 99 0 Details
If 6000 dollars is invested in a bank account at an interest
rate of 9 per cent per year,
Find the amount in the bank after 12 years if interest is
compounded annually:
Find the amount in the bank after 12 years if interest is
compounded quarterly:
Find the amount in the bank after 12 years if interest is
compounded monthly:
Finally, find the amount in the bank after 12 years if
interest is compounded continuously:
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A car was valued at $45,000 in the year 1991. T
depreciated to $15,000 by the year 2000.
A) What was the annual rate of change between
2000?
0.1294 x 09 -0.1149 Round the rate of deci
decimal places.
r =
B) What is the correct answer to part A written
percentage form?
p= 12.94
x 00 -11.49 %.
C) Assume that the car value continues to drop
percentage. What will the value be in the year
value = $ 8550 x 00 10,400 Round to the ned
dollars.
Х
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Section 4.1
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Question 10
く
>
50/1 pt 52 99 0 Details
A house was valued at $95,000 in the year 1994. The value
appreciated to $165,000 by the year 2005.
A) What was the annual growth rate between 1994 and
2005?
Round the growth rate to 4 decimal places.
r =
B) What is the correct answer to part A written in
percentage form?
%.
r =
C) Assume that the house value continues to grow by the
same percentage. What will the value equal in the year
2009 ?
value = $
Round to the nearest thousand dollars.
=
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Section 4.1
Done
色 100
:
Score: 6/15
6/15 answered
Question 12
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50/1 pt 52 99 0 Details
If 6000 dollars is invested in a bank account at an interest
rate of 9 per cent per year,
Find the amount in the bank after 12 years if interest is
compounded annually:
Find the amount in the bank after 12 years if interest is
compounded quarterly:
Find the amount in the bank after 12 years if interest is
compounded monthly:
Finally, find the amount in the bank after 12 years if
interest is compounded continuously:
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