At what points is the given function continuous?f(x, y) = 
A. All (x, y)
B. All (x, y) such that 3x + 6y ? 0
C. All (x, y) such that x + y ? 0
D. All (x, y) such that 3x + 6y ? 0
Answer: D
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Solve the problem.The position (in centimeters) of an object oscillating up and down at the end of a spring is given by 
at time t (in seconds). The value of A is the amplitude of the motion, k is a measure of the stiffness of the spring, and m is the mass of the object. How fast is the object accelerating when it is accelerating the fastest?
A. A2 cm/sec2
B. A
cm/sec2
C. A cm/sec2
D. 
cm/sec2
Solve. Write the fraction in simplest form.Find 
of 120.
A. 12
B. 
C. 10
D. 1440
Find the quotient using long division.
A. 9r2 + 3r + 
B. 9r2 - 3r - 9
C. 9r2 + 3r + 9
D. r2 + 9r + 3
Find the slope.Find the slope of a line perpendicular to the line x = -3.
A. - 
B. -3
C. 0
D. undefined