If y varies directly as x, write a general formula to describe the variation.y = 9 when x = 18
A. y = x + 9
B. y = 2x
C. y = 
x
D. y = 
x
Answer: C
Mathematics
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Find the local extrema of the function, if they exist.f(x) = 
A. Local minimum at (0, -4) B. No local extrema exist C. Local maximum at (0, -4) D. Local maximum at (0, 4)
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Write a polar equation in r and ? of a hyperbola with the focus at the origin, with the eccentricity and directrix r = -12csc?.
What will be an ideal response?
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Write the expression using a single radical sign. Assume that all variables represent positive real numbers. Simplify the radicand if possible.
A. 
B. 2 
C. 2
D. 4 
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Perform the indicated operations. Assume that all variables represent positive numbers.
(
+ 
)
A. 35 + 5
B. 70
C. 1225 + 5
D. 35 + 25
Mathematics