1. You manufacture and sell Objects. Your total cost, TC ...
[Pages:30]Autumn 2011, Conroy 1. You manufacture and sell Objects. Your total cost, T C, is a linear function of quantity, q.
If you make 100 Objects, your cost is $1400. If you make 250 Objects, your cost is $1820. You sell Objects for $35. (a) Find a formula for total cost, T C, as a function of q.
(b) At what quantity, q, do you break even?
(c) What is your marginal cost?
(d) At what quantity is average cost, AC, equal to $11?
Autumn 2011, Conroy 2. You make and sell Things. For a quantity of q Things, your total cost is
T C(q) = 0.1q2 + 2q + 8000. You sell Things for $170. (a) At what quantities do you break even?
(b) At what quantity do you have the greatest profit?
(c) What is your maximum possible profit?
(d) Give a formula for marginal cost, M C.
(e) At what quantity q is marginal cost equal to $40?
Math 111C -- Autumn 2011 Taggart
3
3. (13 points)
height (in feet)
Balloon A is released from ground level at A(t)
t = 0. The height (in feet) of Balloon A after t minutes is given by
A(t) = -0.15t2 + 9t.
The graph of A(t) is given at right.
time (in minutes)
(a) Give a formula for A(5 + h) - A(5) and simplify as much as possible. h
ANSWER: A(5 + h) - A(5) = h
(b) Balloon B has a linear height vs. time graph. Balloon B is at the same height as Balloon A at t = 0 and t = 55. Find the formula for the height (in feet) of Balloon B after t minutes.
ANSWER: B(t) =
(c)
The
average
rate
of
ascent
of
Balloon
A
is
A(t) t
and
the
average rate
of ascent
of
Balloon
B
is
B(t) t
.
Find
the
time
at
which
the
average
rate
of
ascent
of
Balloon
B
is
exactly
4
feet
per
minute faster than the average rate of ascent of Balloon A.
ANSWER: t =
minutes
Winter 2011, Nichifor
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