Decide whether the pair of lines is parallel, perpendicular, or neither.3x - 6y = 818x + 9y = 7
A. parallel
B. perpendicular
C. neither
Answer: B
Mathematics
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The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds). s (m)
When is the body standing still?
A. 2 < t < 3, 4 < t < 5, 7 < t < 9 B. t = 3, t = 5, t = 8 C. 8 < t ? 10 D. 1 < t < 2
Mathematics
Give the appropriate form of the partial fraction decomposition.
A. 
+ 
B. 
+ 
C. 
+ 
D. 
+ 
Mathematics
Find the limit.
A. ? B. 0 C. Does not exist D. -?
Mathematics
Solve the problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 70 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 28 L B. 17.5 L C. 23.3 L D. 35 L
Mathematics