Without graphing the function, determine its amplitude or period as requested.y = -2 cos 
xFind the period.
A. 6?
B. 
C. -2
D. 
Answer: A
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Solve the problem.A gas station sells 4820 gallons of regular unleaded gasoline on a day when they charge $1.35 per gallon, whereas they sell 3847 gallons on a day that they charge $1.40 per gallon. Find a linear equation that relates gallons sold to price.
A. y = -19,460x + 31,107 B. y = -19,460x + 31,091 C. y = -19,460x + 31,069.2 D. y = -19,460x + 31,074.8
Write the satement in symbols. Let x represent the unknown number.The difference of fifteen and a number, divided by three.
A. 
B. 
- 15
C. 15 - 
D. 
Rewrite the rational expression with the indicated denominator.
= 
A. 
B. 
C. 
D. 
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. 3x + y + z - 2w = 10 2x + 3y + 3z + w = -52x + y + 4z + 11w = 11
A. {(6, -4, -2, 1)} B. {(2w + 3, 6w - 7, -10w + 8, w)} C. {(7, -1, -6, 2)} D. {(w + 5, 3w - 7, -4w + 2, w)}