Construction. A construction company has 840 feet of chain-link fence that is used to enclose storage areas for equipment and materials at construction sites. The supervisor wants to set up two identical rectangular storage areas sharing a common fence (see the figure). Assuming that all fencing is used, (A) Express the total area A x enclosed by both pens as a function of x . (B) From physical considerations, what is the domain of the function A ? (C) Graph function A in a rectangular coordinate system . (D) Use the graph to discuss the number and approximate locations of values of x that would produce storage areas with a combined area of 25 , 000 square feet. (E) Approximate graphically (to the nearest foot) the values of x that would produce storage areas with a combined area of 25 , 000 square feet. (F) Determine algebraically the dimensions of the storage areas that have the maximum total combined area. What is the maximum area?
Construction. A construction company has 840 feet of chain-link fence that is used to enclose storage areas for equipment and materials at construction sites. The supervisor wants to set up two identical rectangular storage areas sharing a common fence (see the figure). Assuming that all fencing is used, (A) Express the total area A x enclosed by both pens as a function of x . (B) From physical considerations, what is the domain of the function A ? (C) Graph function A in a rectangular coordinate system . (D) Use the graph to discuss the number and approximate locations of values of x that would produce storage areas with a combined area of 25 , 000 square feet. (E) Approximate graphically (to the nearest foot) the values of x that would produce storage areas with a combined area of 25 , 000 square feet. (F) Determine algebraically the dimensions of the storage areas that have the maximum total combined area. What is the maximum area?
Construction. A construction company has
840
feet of chain-link fence that is used to enclose storage areas for equipment and materials at construction sites. The supervisor wants to set up two identical rectangular storage areas sharing a common fence (see the figure).
Assuming that all fencing is used,
(A) Express the total area
A
x
enclosed by both pens as a function of
x
.
(B) From physical considerations, what is the domain of the function
A
?
(C) Graph function A in a rectangular coordinate system.
(D) Use the graph to discuss the number and approximate locations of values of
x
that would produce storage areas with a combined area of
25
,
000
square feet.
(E) Approximate graphically (to the nearest foot) the values of
x
that would produce storage areas with a combined area of
25
,
000
square feet.
(F) Determine algebraically the dimensions of the storage areas that have the maximum total combined area. What is the maximum area?
Formula Formula A polynomial with degree 2 is called a quadratic polynomial. A quadratic equation can be simplified to the standard form: ax² + bx + c = 0 Where, a ≠ 0. A, b, c are coefficients. c is also called "constant". 'x' is the unknown quantity
(4) (8 points)
(a) (2 points) Write down a normal vector n for the plane P given by the equation
x+2y+z+4=0.
(b) (4 points) Find two vectors v, w in the plane P that are not parallel.
(c) (2 points) Using your answers to part (b), write down a parametrization r: R² —
R3 of the plane P.
(2) (8 points) Determine normal vectors for the planes given by the equations x-y+2z = 3
and 2x + z = 3. Then determine a parametrization of the intersection line of the two
planes.
(3) (6 points)
(a) (4 points) Find all vectors u in the yz-plane that have magnitude [u
also are at a 45° angle with the vector j = (0, 1,0).
= 1 and
(b) (2 points) Using the vector u from part (a) that is counterclockwise to j, find an
equation of the plane through (0,0,0) that has u as its normal.
Chapter 2 Solutions
Finite Mathematics for Business, Economics, Life Sciences and Social Sciences Plus NEW MyLab Math with Pearson eText -- Access Card Package (13th Edition)
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