Chapter 1: Q17E (page 9)
A homeowner mows the lawn every Wednesday afternoon. Sketch a rough graph of the height of the grass as a function of time over the course of a four-week period.
Short Answer
The required graph is as follows.
Chapter 1: Q17E (page 9)
A homeowner mows the lawn every Wednesday afternoon. Sketch a rough graph of the height of the grass as a function of time over the course of a four-week period.
The required graph is as follows.
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(a) \({\bf{f + g}}\)
(b) \({\bf{f}} - {\bf{g}}\)
(c) \({\bf{fg}}\)
(d) \({\bf{f}}/{\bf{g}}\)
and state their domains.
37. \({\bf{f}}\left( x \right) = {x^3} + 2{x^2}\) \(g\left( x \right) = 3{x^2} - 1\)
Prove the statement using the\(\varepsilon \), \(\delta \)definition of a limit.
\(\mathop {\lim }\limits_{x \to 0} {x^3} = 0\)
Find the functions (a)\({\bf{f}} \circ {\bf{g}}\), (b)\({\bf{g}} \circ {\bf{f}}\), (c)\({\bf{f}} \circ {\bf{f}}\), (d) \({\bf{g}} \circ {\bf{g}}\) and their domains.
\({\bf{f}}\left( {\bf{x}} \right){\bf{ = 1 - 3x}}\) \({\bf{g}}\left( {\bf{x}} \right){\bf{ = cosx}}\)
In a certain country, income tax is assessed as follows. There is no tax on income up to \(10,000. Any income over \)10,000 is taxed at a rate of 10%, up to an income of \(20,000. Any income over \)20,000 is taxed at 15%.
(a) Sketch the graph of the tax rate as a function of the income.
(b) How much tax is assessed on an income of \(14,000? On \)26,000?
(c) Sketch the graph of the total assessed tax as a function of the income.
The monthly cost of driving a car depends on the number of miles driven. Lynn found that in May it cost her \(380 to drive 480 mi and in June it cost her \)460 to drive 800 mi.
(a) Express the monthly cost\({\bf{C}}\)as a function of the distance driven\(\)assuming that a linear relationship gives a suitable model.
(b) Use part (a) to predict the cost of driving 1500 miles per month.
(c) Draw the graph of the linear function. What does the slope represent?
(d) What does the y-intercept represent?
(e) Why does a linear function give a suitable model in this situation?
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