Use a half-angle identity to find an exact value for the following, given the information about x. Find cos 
, given that sin x = 
and 360° < x < 450°.
A. 
B. 
C. - 
D. - 
Answer: D
Mathematics
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Convert the area as indicated.3.55 square centimeters to square millimeters
A. 35.5 mm2 B. 3550 mm2 C. 355 mm2 D. 35,500 mm2
Mathematics
Solve the system by graphing on a calculator. Round to the nearest hundredth if necessary.x2 - y2 = 7.82x = 2y - 5
A. {(-6.31, -5.65), (2.97, -1.01)} B. {(-2.97, -1.01), (6.31, -5.65)} C. {(-2.97, 1.01), (6.31, 5.65)} D. {(-6.31, 5.65), (2.97, 1.01)}
Mathematics
Solve.8x + 7 = -33
A. -5
B. - 
C. - 
D. -48
Mathematics
Solve the system of equations using elimination.
A. x = 2, y = 3; x = -2, y = 3 ; x = 2, y = -3; x = -2, y = -3 B. x = 2, y = -3; x = 2, y = 3 C. x = -2, y = -3; x = -3, y = -2 D. x = 2, y = 3; x = 3, y = 2; x = -2, y = -3; x = -3, y = -2
Mathematics