Without graphing the function, determine its amplitude or period as requested.y = 4 cos 
xFind the amplitude.
A. 
B. 
C. 4
D. 6?
Answer: C
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Evaluate the cylindrical coordinate integral.
A. 60 B. 40 C. 60? D. 20?
Give the rectangular coordinates for the point.(2, 270°)
A. (0, 2) B. (0, -2) C. (2, 0) D. (-2, 0)
Rewrite the rational expression with the indicated denominator.
= 
A. 
B. 
C. 
D. 
The percent of light that will pass through a material is given by the formula lgP = -kd, where P is the percent of light passing through the material (in fractions), k is a constant that depends on the material, and d is the thickness of the material in centimeters. The constant k for a piece of tinted glass is 0.4. How thick (in centimeters) is a piece of this glass that allows 50% of the light incident to the glass to pass through it? Round to the nearest hundredth of a centimeter.
a. 1.73 b. 0.75 c. 4.25 d. 9.78 e. 3.32