Solve the problem.If a, b, and c are all nonzero, then determine if the plane ax + by + cz = 1 always intersects all three coordinate planes (i.e. the planes x = 0, y = 0, z = 0), sometimes intersects them, or never intersects them.
A. Never
B. Always
C. Sometimes
Answer: B
Mathematics
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Find the limit, if it exists.
A. Does not exist B. 6 C. -6 D. 0
Mathematics
Solve the problem.An observer to a rocket launch was 800 ft from the take-off position. The observer found the angle of elevation of the rocket as a function of time to be 
Therefore, the height h (in ft) of the rocket was 
Find the time rate of change of height at 
A. 240 ft/s B. 400 ft/s C. 1100 ft/s D. 6700 ft/s
Mathematics
Solve the problem.The space in a landfill decreases with time as given by the function 
where t is measured in years. How much space is left when t = 1?
A. 200 B. 380 C. 210 D. 110
Mathematics
The graph of a piecewise-defined function is given. Write a definition for the function. 
A. 
B. 
C. 
D.
f(x) = 
Mathematics