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1. (4 pts) Which of these graphs represent a one-to-one function?
Answer(s): ____________
(
no explanation required
.) (There may be more than one graph that qualifies.)
(A)
(B)
(C)
(D)
2. (6 pts) Based on data about the growth of a variety of ornamental cherry trees, the following logarithmic
model about these trees was determined:
h
(
t
) = 6.108 ln(
t
) + 6.099,
where
t
= age of tree in years and
h
(
t
) = height of tree, in feet.
(Note that "ln" refers to the natural log function)
(explanation optional)
Using the model,
(a) At age 3 years, how tall is this type of ornamental cherry tree, to the nearest tenth of a foot?
(b) At age 12 years, how tall is this type of ornamental cherry tree, to the nearest tenth of a foot?
10 pages
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