Determine the domain of the variable x in the expression.f(x) = 
A. {x|x ? 0}
B. {x|x ? 8}
C. {x|x ? -8}
D. all positive real numbers
Answer: C
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Use the order of operations to simplify the expression.
2
A. 
B. 
C. 
D. 
Solve for the requested variable without determining the constant of variation, k. Use the fact that if 
and 
then 
so that 
Assuming that y varies directly as the cube of x, and y = 10 when x = 16, find y when x = 40.
A. y = 
B. y = 
C. y = 4
D. y = 25
Solve the problem.At a state fair truck pull, two pickup trucks are attached to the back end of a monster truck as illustrated in the figure. One of the pickups pulls with a force of 1800 pounds and the other pulls with a force of 3400 pounds with an angle of 45° between them. With how much force must the monster truck pull in order to remain unmoved? HINT: Find the resultant force of the two trucks. Round your answer to the nearest tenth. 
A. The truck must pull with a force of 2478.9 lb. B. The truck must pull with a force of 4843.0 lb. C. The truck must pull with a force of 4496.1 lb. D. The truck must pull with a force of 1704.4 lb.
Find: a. The center and radius of the circle. b. The x- and y-intercepts of the graph of the circle.x2 + y2 - 4x + 4y - 1 = 0
A. a. center = (-2, -2); radius = 3
b. (2 + 
, 0), (0, -2 + 
)
B. a. center = (-2, 2); radius = 9
b. (2 + 
, 0), (0, -2 + 
)
C. a. center = (2, -2); radius = 3
b. (-2 + 
, 0), (-2 - 
, 0), (0, 2 + 
), (0, 2 - 
)
D. a. center = (2, -2); radius = 3
b. (2 + 
, 0), (2 - 
, 0), (0, -2 + 
), (0, -2 - 
)