Find the vertex for the parabola whose equation is given.y = x2 + 8x + 3
A. (8, 131)
B. (-4, -13)
C. (4, 51)
D. (-4, -45)
Answer: B
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The speed for certain animals is related to the stride length by a power function. The value of the power in this function is 
. If the stride length is doubled, how is the speed affected? Round your answer to two decimal places if necessary.
?
A. Speed is multiplied by 1.12. B. Speed is multiplied by 2.08. C. Speed is multiplied by 2.18. D. Speed is multiplied by 1.3.
Solve, rewrite in interval notation, and graph.5x - 8 ? -13 and 5x - 8 ? 7
A. (-1, 3)
B. [-1, 3)
C. (-1, 3]
D. [-1, 3]
Solve the linear programming problem.A doctor has told a sick patient to take vitamin pills. The patient needs at least 6 units of vitamin A and at least 6 units of vitamin B. The red vitamin pills cost 
each and contain 1 unit of A and 2 units of B. The blue vitamin pills cost 
each and contain 2 units of A and 1 unit of B. To avoid indigestion, the patient should take no more than 4 red pills and no more than 7 blue pills. How many pills should the patient take each day to minimize costs?
A. 4 red and 7 blue B. 2 red and 2 blue C. 0 red and 6 blue D. 4 red and 1 blue
Simplify the radical expression. Assume that all variables represent nonnegative real numbers.(
- 7)(
+ 6)
A. x
- 42
B. x
+ 6
- 7
- 42
C. x
- 42
D. x
+ 
- 42