Answer the question.Which of the following describes a study in which neither the participants nor the experimenters know which participants are in the control group?
A. Case-control study
B. Double-blind experiment
C. Single-blind experiment
D. Observational study
Answer: B
Mathematics
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Find the volume of the indicated region.the solid cut from the first octant by the surface 
A. 
B. 
C. 
D. 
Mathematics
Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.x = 2
, x = - 2y, y = 1
A. 
?
B. 
?
C. 
?
D. 4?
Mathematics
Find the exact value of the expression using a sum or difference identity.sin (-165°)
A. 
B. 
C. 
D. 
Mathematics
Find the equivalent earnings.Keith's yearly salary is $18,408. How much does he earn in a semimonthly pay period?
A. $708.00 B. $767.00 C. $354.00 D. $1534.00
Mathematics