Cellphone Revenues The annual revenue for cellphone use in China for the period 2000–2005 was projected to follow the equation 60 R ( t ) = 14 t + 24 billon dollars inyear t . ( t = 0 represents2000.) At the same time, there were approximately 68 million subscribers in 2000. Assuming that the number of subscribers increases exponentially with an annual growth constant of 10%, give a formula for the annual revenue per subscriber in year t . Hence, project to the nearest dollar the annual revenue per subscriber and its rate of change in 2002. (Be careful with units!)
Cellphone Revenues The annual revenue for cellphone use in China for the period 2000–2005 was projected to follow the equation 60 R ( t ) = 14 t + 24 billon dollars inyear t . ( t = 0 represents2000.) At the same time, there were approximately 68 million subscribers in 2000. Assuming that the number of subscribers increases exponentially with an annual growth constant of 10%, give a formula for the annual revenue per subscriber in year t . Hence, project to the nearest dollar the annual revenue per subscriber and its rate of change in 2002. (Be careful with units!)
Solution Summary: The author calculates the formula for the annual revenue per subscriber in year t and the rate of change in 2002.
Cellphone Revenues The annual revenue for cellphone use in China for the period 2000–2005 was projected to follow the equation60
R
(
t
)
=
14
t
+
24
billon dollars
inyear t. (
t
=
0
represents2000.) At the same time, there were approximately 68 million subscribers in 2000. Assuming that the number of subscribers increases exponentially with an annual growth constant of 10%, give a formula for the annual revenue per subscriber in year t. Hence, project to the nearest dollar the annual revenue per subscriber and its rate of change in 2002. (Be careful with units!)
Consider the function f(x) = x²-1.
(a) Find the instantaneous rate of change of f(x) at x=1 using the definition of the derivative.
Show all your steps clearly.
(b) Sketch the graph of f(x) around x = 1. Draw the secant line passing through the points on the
graph where x 1 and x->
1+h (for a small positive value of h, illustrate conceptually). Then,
draw the tangent line to the graph at x=1. Explain how the slope of the tangent line relates to the
value you found in part (a).
(c) In a few sentences, explain what the instantaneous rate of change of f(x) at x = 1 represents in
the context of the graph of f(x). How does the rate of change of this function vary at different
points?
1. The graph of ƒ is given. Use the graph to evaluate each of the following values. If a value does not exist,
state that fact.
и
(a) f'(-5)
(b) f'(-3)
(c) f'(0)
(d) f'(5)
2. Find an equation of the tangent line to the graph of y = g(x) at x = 5 if g(5) = −3 and g'(5)
=
4.
-
3. If an equation of the tangent line to the graph of y = f(x) at the point where x 2 is y = 4x — 5, find ƒ(2)
and f'(2).
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