A tamoxifen study claims that a combination of chemotherapy and the hormone therapy tamoxifen is more effective than tamoxifen alone in preventing breast cancer. In the study, a group of researchers from the U.S. and Canada studied 1477 postmenopausal women with early-stage breast cancer. The women were randomly assigned to one of three study groups. Group A (361 patients) received tamoxifen alone on a daily basis for five years. Group B (566 patients) received chemotherapy and tamoxifen for six months, and then completed five years of tamoxifen treatment. Group C (550 patients) received chemotherapy alone for six months followed by five years of tamoxifen treatment. All 1477 patients knew which treatment they were receiving.This study is
A. not an experiment.
B. double-blind.
C. blind, but not double-blind.
D. not blind.
E. none of these
Answer: D
Mathematics
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Find the minimum-cost spanning tree for the graph.
A. 
B. 
C. 
D. 
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Solve the problem.An auditorium has 15 rows with 10 seats in the first row, 12 in the second row, 14 in the third row, and so on. How many seats are in the auditorium?
A. 255 seats B. 390 seats C. 360 seats D. 300 seats
Mathematics
Solve the equation by the Square Root Method.x2 - 10 = 0
A. {-10, 10}
B. {10}
C. {
}
D. {
, -
}
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Graph the inequality or system of inequalities.y ? 3y ? 2x
A. 
B. 
C. 
D. 
Mathematics