Simplify.87 - 3 ? 4 ? 2
A. 672
B. 150
C. 63
D. 78
Answer: C
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A. Neither the members of the control group nor the members of the treatment group know to which of the two groups they belong. B. There is a control group and a treatment group. C. The scientists conducting the study do not know which individuals are in the treatment group and which are in the control group. D. The size of the control group and treatment group are the same. E. none of these
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, ? in quadrant II, find the exact value of cos
A. 
B. - 
C. 
D. 
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