Determine whether the study is an experiment or an observational study.A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 75 people to a treatment group and 75 to a placebo group. The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients' symptoms are evaluated.
A. experiment
B. observational study
Answer: A
Mathematics
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Add or subtract as indicated. Write the answer in lowest terms.19
+ 7
A. 27
B. 25
C. 26
D. 19
Mathematics
Solve the trigonometric equation symbolically, graphically, or numerically for 
csc ? + 2 = 0
A. ? = 210°, 330° B. ? = 60°, 120°, 240°, 300° C. ? = 240°, 300° D. ? = 30°, 150°, 210°, 330°
Mathematics
Sketch the graph of the polynomial function.f(x) = 4x4 + 8x3 - 33x2 - 2x + 8
A. 
B. 
C. 
D. 
Mathematics
Graph the pair of functions on the same plane. Use a dashed line for g(x).f(x) = 
, g(x) = 
+ 5
A. 
B. 
C. 
D. 
Mathematics