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19.) a
20.) c
21.) e
22.) b
23.) d

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39. D (a+b or ln2+ln5)
40.

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Make sure to have:
Logb(xy)= logbX+ logbY
Logb(x/y) = logbX - logbY

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Logarithmic form to expanded form:
Multiplication
logbXY —> logbX+logbY
Division
logbX/Y —> logbX-logbY

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#39: (b) ab       D  a+b
#40: (c)4b       A  2a+b

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13- d
14- a
15- d
16- b

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Answers to #41-43

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#34-38