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Harshbarger and Reynolds - Math Applications 9/e (Homework)

James Finch

Math - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 13 / 28

Due : Sunday, January 27, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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13/28 (46.4%)

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    Here are some textbook questions from Math Applications 9/e by Ronald J. Harshbarger and James J. Reynolds published by Brooks/Cole Publishing. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and allows you to try another version of the same question for practice.

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1. –/1 points HarMathAp9 1.1.005. My Notes
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Solve the equation.
− 2 x = 12
5
x =

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2. –/1 points HarMathAp9 1.1.027. My Notes
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Solve for t.
S = P + Pdt
t =

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3. –/5 points HarMathAp9 1.2.001. My Notes
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Consider the values in the following table.
x -9 -3 -2 1 2.2 7 9 12 16 20
y 5 5 6 10 14 16 40 27 27 65
(a) Explain why the table defines y as a function of x.
    

(b) State the domain and range of this function. (Enter your answers as a comma-separated list.)
D = { }
R = { }

(c) For y = f(x), find f(-2), and f(9).
f(-2) =
f(9) =

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4. –/5 points HarMathAp9 1.2.051. My Notes
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Suppose that the cost C (in dollars) of removing p percent of the particulate pollution from the smokestacks of an industrial plant is given by the equation shown below.
C(p) = 6300p
100 − p
(a) Find the domain of this function. Recall that p represents the percent pollution that is removed.
Domain:
    


(b) Find the functional value. (Round your answer to the nearest cent.)
C(44) = $

(c) Find the functional value.
C(90) = $

(d) Find the functional value.
C(99) = $

(e) Find the functional value.
C(99.6) = $

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5. –/1 points HarMathAp9 1.3.007.MI. My Notes
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Find the slope of the line passing through the given pair of points.
(8, 18) and (2, 16)
m =

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6. –/3 points HarMathAp9 1.4.017. My Notes
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Consider the following.
y = 0.002x − 0.06
(a) Algebraically find the x- and y-intercepts of the graph.
y = 
x = 


(b) Graph the equation with a graphing utility; use a window that includes the intercepts.
No Solution
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7. –/2 points HarMathAp9 1.4.039. My Notes
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Consider the following. (Give your answers correct to four decimal places. Enter your answers as a comma-separated list.)
y = x2 – 7x – 5
(a) Use a graphing utility to approximate two x-intercepts of the graph of the function.
x =

(b) Give the approximate zeros of the function.
x =

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8. –/2 points HarMathAp9 1.5.005. My Notes
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Solve the system of equations by using graphical methods.
 
6x − 3y = 15
x − 3y = -10
Draw the two lines.
No Solution
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Enter the intersecting point.
(x, y) = ( )

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9. –/3 points HarMathAp9 1.5.051. My Notes
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–/3
 
Each ounce of a substance A supplies 2% of the nutrition a patient needs. Substance B supplies 10% of the required nutrition per ounce, and substance C supplies 16% of the required nutrition per ounce. If digestive restrictions require that substances A and C be given in equal amounts, and the amount of substance B be
1
5
of either of these other amounts, find the number of ounces of each substance that should be in the meal to provide 100% of the required nutrition.
oz of substance A
oz of substance B
oz of substance C

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10. –/5 points HarMathAp9 1.6.008. My Notes
Question Part
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A linear revenue function is R = 38.46x.
(a) What is the slope?


(b) What is the marginal revenue, and what does it mean?
MR =
Each additional unit sold adds $ to the total revenue.


(c) What is the revenue received from selling one more item if 48 are currently being sold?
$

What is the revenue received from selling one more item if 82 are being sold?
$

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