81. Data Plan Cost The monthly cost C , in dollars, for wireless data plans with x gigabytes of data included is shown in the table. Since each input value for x corresponds to exactly one output value for C , the plan cost is a function of the number of data gigabytes. Thus C ( x ) represents the monthly cost for a wireless data plan with x gigabytes included. (a) Plot the points ( 4 , 70 ) , ( 6 , 80 ) , ( 10 , 100 ) , and so on in a Cartesian plane. (b) Draw a line segment from the point ( 10 , 100 ) to ( 30 , 225 ) . What does the slope of this line segment represent? (c) Find the average rate of change of the monthly cost from 4 to 10 gigabytes. (d) Find the average rate of change of the monthly cost from 10 to 30 gigabytes. (e) Find the average rate of change of the monthly cost from 30 to 50 gigabytes. (f) What is happening to the average rate of change as the gigabytes of data increase?
81. Data Plan Cost The monthly cost C , in dollars, for wireless data plans with x gigabytes of data included is shown in the table. Since each input value for x corresponds to exactly one output value for C , the plan cost is a function of the number of data gigabytes. Thus C ( x ) represents the monthly cost for a wireless data plan with x gigabytes included. (a) Plot the points ( 4 , 70 ) , ( 6 , 80 ) , ( 10 , 100 ) , and so on in a Cartesian plane. (b) Draw a line segment from the point ( 10 , 100 ) to ( 30 , 225 ) . What does the slope of this line segment represent? (c) Find the average rate of change of the monthly cost from 4 to 10 gigabytes. (d) Find the average rate of change of the monthly cost from 10 to 30 gigabytes. (e) Find the average rate of change of the monthly cost from 30 to 50 gigabytes. (f) What is happening to the average rate of change as the gigabytes of data increase?
Solution Summary: The author explains how to find the following values using the given data: a. Plotting given points in the Cartesian plane; b. Drawing the line segment from the point (10) to (30) and finding the
81. Data Plan Cost The monthly cost C, in dollars, for wireless data plans with x gigabytes of data included is shown in the table. Since each input value for x corresponds to exactly one output value for C, the plan cost is a function of the number of data gigabytes. Thus
represents the monthly cost for a wireless data plan with x gigabytes included.
(a) Plot the points
,
,
, and so on in a Cartesian plane.
(b) Draw a line segment from the point
to
. What does the slope of this line segment represent?
(c) Find the average rate of change of the monthly cost from 4 to 10 gigabytes.
(d) Find the average rate of change of the monthly cost from 10 to 30 gigabytes.
(e) Find the average rate of change of the monthly cost from 30 to 50 gigabytes.
(f) What is happening to the average rate of change as the gigabytes of data increase?
1. Compute
Lo
F⚫dr, where
and C is defined by
F(x, y) = (x² + y)i + (y − x)j
r(t) = (12t)i + (1 − 4t + 4t²)j
from the point (1, 1) to the origin.
2. Consider the vector force: F(x, y, z) = 2xye²i + (x²e² + y)j + (x²ye² — z)k.
(A) [80%] Show that F satisfies the conditions for a conservative vector field, and find a potential
function (x, y, z) for F. Remark: To find o, you must use the method explained in the
lecture.
(B) [20%] Use the Fundamental Theorem for Line Integrals to compute the work done by F on
an object moves along any path from (0,1,2) to (2, 1, -8).
help please
Chapter 2 Solutions
Precalculus Enhanced with Graphing Utilities (7th Edition)
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