Find the standard equation of a parabola with the given focus or directrix. Assume that the vertex is at the origin.Focus 
A. y2 = - 
x
B. y2 = 
x
C. x2 = - 
y
D. x2 = -44y
Answer: C
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Factor completely. If the polynomial is prime, state so.343x3 - y3
A. (7x - y)(49x2 + y2) B. (7x - y)(49x2 + 7xy + y2) C. (7x + y)(49x2 - 7xy + y2) D. (343x - y)(x2 + 7xy + y2)
Use a proportion to solve the problem.On a map of the Fox River, 1 centimeter represents 5.5 kilometers. If a trail by the river is actually 18.15 kilometers long, what is the length of the trail on the map?
A. 7.65 cm B. 5.3 cm C. 3.3 cm D. 12.65 cm
Solve the problem.A person with no more than $3,000 to invest plans to place the money in two investments, telecommunications and pharmaceuticals. The telecommunications investment is to be no more than 4 times the pharmaceuticals investment. Write a system of inequalities to describe the situation. Let 
to be invested in telecommunications and 
to be invested in pharmaceuticals.
A. x + y = 3,000 y ? 4x x ? 0 y ? 0 B. x + y ? 3,000 4x ? y x ? 0 y ? 0 C. x + y ? 3,000 x ? 4y x ? 0 y ? 0 D. x + y = 3,000 x ? 4y x ? 0 y ? 0
Perform the indicated operation. Simplify if possible.
- 
A. 
B. 
C. 
D. 