Without graphing the function, determine its amplitude or period as requested.y = cos 5xFind the period.
A. 2?
B. 1
C. 5
D. 
Answer: D
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Find the value of the indicated trigonometric function of the angle ? in the figure. Give an exact answer with a rational denominator.
Find cos ?.
A. cos ? = 
B. cos ? = 
C. cos ? = 
D. cos ? = 
Find the product.(3xy2 - 5y)(3xy2 + 5y)
A. 9x2y4 + 30xy3 - 25y2 B. 9x2y4 - 30xy3 - 25y2 C. 9x2y4 - 25y2 D. 3x2y4 - 5y2
The graph of a function is given. Determine whether the function is increasing, decreasing, or constant on the given interval.(1, 5)
A. increasing B. constant C. decreasing
Solve the problem.A company wishes to manufacture a box with a volume of 40 cubic feet that is open on top and is twice as long as it is wide. Find the width of the box that can be produced using the minimum amount of material. Round to the nearest tenth, if necessary.
A. 6.4 ft B. 3.2 ft C. 7.2 ft D. 3.6 ft