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Topic
Mathematics
Study Set
Intermediate Algebra
Quiz 9: Exponential and Logarithmic Functions
Path 4
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Question 201
Short Answer
Use the properties of logarithms to write each expression as a single logarithm. -Write the expression
log
ā”
3
4
x
2
y
+
1
\log_3\frac{4x^2}{y+1}
lo
g
3
ā
y
+
1
4
x
2
ā
as the sum or difference of multiples of logarithms.
Question 202
Short Answer
Find the exact value. -
l
n
e
ā
4
ln e^{-4}
l
n
e
ā
4
Question 203
Short Answer
Find the exact value. -log 1000
Question 204
Short Answer
Find the exact value. -Approximate log
3
21 to four decimal places.
Question 205
Short Answer
Find the exact value. -Solve:
log
ā”
3
(
x
+
1
)
+
log
ā”
3
(
x
+
3
)
=
log
ā”
3
3
\log_3 (x + 1) + \log_3 ( x + 3) = \log_3 3
lo
g
3
ā
(
x
+
1
)
+
lo
g
3
ā
(
x
+
3
)
=
lo
g
3
ā
3
.
Question 206
Short Answer
For f ( x) = x - 9 and g(x) = 5 - x
2
, find (f - g)(x) and ( f
ā
\circ
ā
g)(x)
Question 207
Short Answer
Determine whether the function is one-to-one. If it is one-to-one, list the elements of its inverse {(3, -4), (4, 5), (6, -2), (2, 4), (9, -9)}
Question 208
Short Answer
f
(
x
)
=
x
+
1
3
f(x) = \sqrt[3]{x+1}
f
(
x
)
=
3
x
+
1
ā
is a one-to-one function. Find its inverse, and graph both on the same set of axes.
Question 209
Short Answer
Solve fpr x:
2
(
7
+
3
x
)
=
4
ā
1
2^{(7+3x)} = 4^{-1}
2
(
7
+
3
x
)
=
4
ā
1
Question 210
Short Answer
Graph the exponential function
y
=
(
1
/
3
)
ā
x
+
2
y = (1/3)^{-x} + 2
y
=
(
1/3
)
ā
x
+
2
Question 211
Short Answer
The number of bacteria in a culture that initially contains 1200 bacteria grows at a rate of 6.9% per hour. How many bacteria are there after 10 hours? Use y = 1200(2.7)
0.069t
where t is time in hours