Express the sum or difference as a product of sines and/or cosines.sin (2?) - sin (4?)
A. 2 sin (3?) cos ?
B. 2 cos (2?) cos (3?)
C. -2 sin ?
D. -2 sin ? cos (3?)
Answer: D
Mathematics
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Name the following angle using three kinds of notation, if possible.
Fill in the blank(s) with the appropriate word(s).
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Simplify using the order of operations.83 - [8 + 5
] + 23 - 8
A. 453 B. 499 C. 509 D. 529
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Add. Simplify, if possible.-422.69 + 566.08
A. -988.77 B. 143.39 C. -143.39 D. 988.77
Mathematics
Solve the problem.A boat heads upstream a distance of 30 miles on the Mississippi river, whose current is running at 5 miles per hour. If the trip back takes an hour less, what was the speed of the boat in still water? Give the answer rounded to two decimal places, if necessary.
A. 16.58 mph B. 15 mph C. 18.03 mph D. 6 mph
Mathematics