Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that y varies directly with x. When x = 
, then y = 9.
A. k = 
; y = x + 
B. k = 
; y = 
x
C. k = 36; y = 36x
D. k = 
; y = 
x
Answer: C
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Evaluate using the order of operations.-3.9 - (2.3)2 - (-4.2)
A. -4.99 B. -13.39 C. 2.81 D. 5.59
Solve.A rectangular box with volume 517 cubic feet is built with a square base and top. The cost is $1.50 per square foot for the top and the bottom and $2.00 per square foot for the sides. Let x represent the length of a side of the base in feet. Express the cost of the box as a function of x and then graph this function. From the graph find the value of x, to the nearest hundredth of a foot, which will minimize the cost of the box.
A. 8.79 feet B. 8.83 feet C. 8.91 feet D. 8.49 feet
Find the sum of the terms of the arithmetic sequence.1, 3, 5, 7, . . ., 45 n = 23
A. 1058 B. 1104 C. 552 D. 529
Solve the problem.Find the center of mass of a thin infinite region in the first quadrant bounded by the coordinate axes and the curve 
if 
.
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 