Express the given quantity in terms of sin x or cos x.cos 
A. cos x + sin x
B. cos x
C. sin x
D. -sin x
Answer: C
Mathematics
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Solve the system by elimination.x2 + y2 = 181x2 - y2 = -19
A. (-9, -10), (-10, -9) B. (9, 10), (10, 9), (-9, -10), (-10, -9) C. (9, -10), (9, 10) D. (9, 10), (-9, 10), (9, -10), (-9, -10)
Mathematics
Perform the indicated operation.9 - (-12)
A. 21 B. -21 C. 3 D. -3
Mathematics
Perform the indicated operation, where possible.
+ 
A. 
B. 
C. 
D. 
Mathematics
Solve.The pitch of a screw is the distance between threads. With each complete rotation of the screw, it goes in or out a distance equal to its pitch. How far will a screw with a pitch of 
in. go into a piece of wood when it is turned 10 complete rotations clockwise?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
Mathematics