Find the domain of the rational expression. 
A. {x|x is a real number and x ? 0}
B. {x|x is a real number}
C. {x|x is a real number and x ? 5}
D. {x|x is a real number and x ? 5 and x ? 0}
Answer: D
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Solve the problem.A boat moves 6 kilometers upstream in the same amount of time it moves 20 kilometers downstream. If the rate of the current is 5 kilometers per hour, find the rate of the boat in still water.
A. 2
kilometers per hour
B. 5 kilometers per hour
C. 9
kilometers per hour
D. 8
kilometers per hour
Subtract.(0.5x4 - 0.6x2 + 0.5) - (2.8x4 + 4.4x - 1.4)
A. -2.3x4 - 0.6x2 - 4.4x + 1.9 B. -2.3x4 - 0.6x2 - 4.4x - 0.9 C. -2.3x4 - 0.6x2 + 4.4x + 1.9 D. -2.3x4 - 0.5x2 - 0.9
Graph the parabola and label the vertex. Find the x-intercept.x = -3(y + 6)2 - 2
A. vertex (2, -6), x-intercept (-110, 0)
B. vertex (-2, -6), x-intercept (-106, 0)
C. vertex (-2, -6), x-intercept (106, 0)
D. vertex (2, -6), x-intercept (110, 0)
Find the outside surface area, when ?a? = 6, h? = 7.
?
?
?
A. 84 in. 2 B. 204 in. 2 C. 168 in. 2 D. 120 in. 2 E. 78 in. 2