Use a calculator to solve the equation on the interval [0, 2?). Round to the nearest hundredth of a radian.cos 3x = cos x
A. 1.57, 4.71
B. 0, 0.79, 2.36, 3.14, 3.93, 5.50
C. 0, 1.57, 3.14, 4.71
D. 0.79, 1.57, 2.36, 3.93, 4.71, 5.50
Answer: A
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A 1.5-mm layer of paint is applied to one side of the following surfaces. Find the volume of paint needed. Assume that x and y are measured in meters.The spherical zone generated when the upper portion of the circle x2 + y2 = 121 on the interval 
is revolved about the x-axis.
A. 
? m3
B. 594? m3
C. 
m3
D. 
? m3
Find all values of x for which the following is true. ? sec x is undefined. ?
A. 
B. 
C. 
D. 
E. 
Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $712.80?
A. {x?55 < x < 53} B. {x?54 < x < 66} C. {x?24 < x < 36} D. {x?56 < x < 64}
Write the equation in standard form.8x2 - 3y2 + 24 = 0
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1