Find the domain of the variable in the equation. Write the answer in interval notation.
= x2 + 1
A. (-?, 3) ? (3, ?)
B. (-?, 4) ? (4, ?)
C. (0, ?)
D. (-?, 0) ? (0, ?)
Answer: C
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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. 8.83 feet B. 8.79 feet C. 8.91 feet D. 8.49 feet
According to the 2000 U.S. Census, Boulder, Colorado, has a population of 94,673, of whom 45,778 are female. If 200 citizens of Boulder are selected at random, what is the probability that between 95 and 100 of them will be female? (U.S. Bureau of the Census.)
What will be an ideal response?
Find the slope of the line going through the given pair of points.(3.9, 4.4) and (3.4, 1.9)
A. -5
B. 
C. 5
D. - 
Solve the system of equations using substitution.
A. x = 5, y = 10; x = 5, y = -10 or (5, 10), (5, -10) B. x = 5, y = 10 or (5, 10) C. x = 5, y = 10; x = -5, y = 0 or (5, 10), (-5, 0) D. x = 5, y = 10; x = 5, y = -10; x = -5, y = 0 or (5, 10), (5, -10), (-5, 0)