Solve the problem.If f(?) = sin ? and f(a) = - 
, find the exact value of f(a) + f(a + 2?) + f(a + 4?).
A. 
B. - 
C. - 
D. - 
+ 6?
Answer: B
Mathematics
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Solve the problem.Three receiving stations at (8, 11), (4, 6), and (12, 9) record distances to an earthquake of 2 units, 5 units, and 4 units, respectively.Find the coordinates of the epicenter.
A. (1, 2) B. (8, 9) C. (9, 8) D. (-6, -5)
Mathematics
Write as a decimal.
A. 0.84 B. 0.74 C. 0.75 D. 0.64
Mathematics
Write as a percent.5
A. 0.05% B. 0.5% C. 500% D. 250%
Mathematics
Solve the equation on the interval [0, 2?).cos 2x = 
- cos 2x
A. 
, 
, 
, 
B. 0, 
, ?, 
C. 
, 
, 
, 
D. no solution
Mathematics