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Concept explainers
Area of a Box An open box with a square base is to have a volume of 12 ft3.
- (a) Find a function that models the surface area of the box.
- (b) Find the box dimensions that minimize the amount of material used.
(a)
![Check Mark](/static/check-mark.png)
To find: The function that models the surface area of a open box with square base whose volume is
Answer to Problem 27P
The function that models the surface area of given box is
Explanation of Solution
Let the dimension of square base be x and height h
Surface area
Volume of the box is,
Substitute 12 for
Divide both sides of above equation by
Summarize all the information as shown in the table below.
In Words | In Algebra |
Surface Area |
|
Length of side of square base. |
|
Height of the box |
|
Use the information in the table and model the function.
Thus, the function that models the surface area of given box is
(b)
![Check Mark](/static/check-mark.png)
To find: The dimensions of the box which minimize the material used to make the box.
Answer to Problem 27P
The length of square base of box is approximately
Explanation of Solution
The function as calculated in part (a) is,
Sketch the graph of above function as shown below.
Figure (1)
Observe from the graph shown in Figure (1) that it attains minimum value at
Length of square base is
Height of box as calculated in terms of length of base in part (a) is,
Substitute
Thus, the length of square base of box is approximately
Chapter 2 Solutions
EBK PRECALCULUS: MATHEMATICS FOR CALCUL
- Let f be a function whose graph consists of 5 line segments and a semicircle as shown in the figure below. Let g(x) = √ƒƒ(t) dt . 0 3 2 -2 2 4 5 6 7 8 9 10 11 12 13 14 15 1. g(0) = 2. g(2) = 3. g(4) = 4. g(6) = 5. g'(3) = 6. g'(13)=arrow_forwardThe expression 3 | (3+1/+1) of the following integrals? A Ов E + + + + 18 3+1+1 3++1 3++1 (A) √2×14 dx x+1 (C) 1½-½√ √ ² ( 14 ) d x (B) √31dx (D) So 3+x -dx is a Riemann sum approximation of which 5 (E) 1½√√3dx 2x+1arrow_forward2. Suppose the population of Wakanda t years after 2000 is given by the equation f(t) = 45000(1.006). If this trend continues, in what year will the population reach 50,000 people? Show all your work, round your answer to two decimal places, and include units. (4 points)arrow_forward
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- 3) If a is a positive number, what is the value of the following double integral? 2a Love Lv 2ay-y² .x2 + y2 dadyarrow_forward16. Solve each of the following equations for x. (a) 42x+1 = 64 (b) 27-3815 (c) 92. 27² = 3-1 (d) log x + log(x - 21) = 2 (e) 3 = 14 (f) 2x+1 = 51-2xarrow_forward11. Find the composition fog and gof for the following functions. 2 (a) f(x) = 2x+5, g(x) = x² 2 (b) f(x) = x²+x, g(x) = √√x 1 (c) f(x) = -1/2) 9 9(x) = х = - Xarrow_forward
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