Write the sum without sigma notation and evaluate it.
A. cos 8? + cos 24? = 2
B. cos 8? - cos 16? + cos 24? = - 1
C. -cos 8? + cos 16? - cos 24? = -1
D. cos 8? - cos 16? + cos 24? = 1
Answer: D
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Find the derivative of the function at the given point in the direction of A.
A. - 
B. - 
C. - 
D. - 
If you have the following function, f ( x ) = -x 2 - 5x + 4, compute f (3), f (-2), f (5), f (-4).
A. f (3) = 0, f (-2) = 21, f (5) = 6, f (-4) = 43 B. f (3) = –2, f (-2) = 18, f (5) = 4, f (-4) = 40 C. f (3) = 1, f (-2) = 20, f (5) = 7, f (-4) = 42 D. f (3) = –1, f (-2) = 19, f (5) = 5, f (-4) = 41 E. f (3) = –3, f (-2) = 16, f (5) = 2, f (-4) = 39
Determine whether the function is a solution of the wave equation.w(x, t) = cos (-6ct) sin (-6x)
A. Yes B. No
Solve the absolute value inequality. Write your answer in interval notation.|x - 13| < 19
A. (-?, -6) B. (-32, 6) C. (-?, 32) D. (-6, 32)