Find the exact value of the indicated trigonometric function of the angle ? in the figure. Rationalize the denominator where necessary.Find cos ?.
A. 
B. 
C. 
D. 
Answer: B
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Solve the problem.A box is to be made from a rectangular piece of cardboard by cutting a square from each corner and folding up the sides. The rectangular piece of cardboard is originally 28 inches long and 54 inches wide, and the squares removed from the corners are x inches wide. The volume of the box is given by the function 
What restrictions must be placed on x to satisfy the conditions of this model? In other words, what is the domain of this function?
A. 0 < x < 27 B. 0 < x < 14 C. x > 0 D. x > 14
Solve the equation.
= 36y
A. 
B. 
C. 
D. 
Solve the problem.The period of vibration P for a pendulum varies directly as the square root of the length L. If the period of vibration is 4 sec when the length is 64 inches, what is the period when L = 2.25 inches?
A. 4.5 sec B. 4.75 sec C. 0.75 sec D. 4.25 sec
Establish the identity.sin 
= 
(cos x + sin x)
What will be an ideal response?