Answer the question.Double blinding is used in an experiment to avoid which of the following problems?
A. If improvement is observed in a patient, it is difficult to know whether this is due to the treatment or the placebo effect
B. If the patient knows that he received the placebo and not the treatment he may be angry and fail to tell the truth
C. If the researcher knows that the patient received the treatment, the researcher may also experience health changes
D. If an experimenter knows whether the patient has received the treatment or the placebo, this may influence how he or she questions the patient
Answer: D
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Solve the problem.Carol decides to hire a snow removal company for plowing her very long driveway this winter. Abe's Plowing requires a $60 nonrefundable reservation fee at the start of the winter and charges $100 every time they come out to plow. Barney's Plowing requires a reservation fee of $110 but only charges $90 each time they come out to plow. Solve the system of equestions by the substitution method to find out how many times Carol would have to be plowed out for the cost of the plowing companies to be the same. How many times would this be?
A. 4 times plowing B. 6 times plowing C. 7 times plowing D. 5 times plowing
Divide f(x) by d(x), and write a summary statement in the form indicated.f(x) = x2 - 14x + 6; d(x) = x - 7 (Write answer in polynomial form)
A. f(x) = (x - 7)2 - 43 B. f(x) = (x - 7)(x + 5) - 43 C. f(x) = (x - 7)(x + 5) + 43 D. f(x) = (x - 7)2 + 43
Solve the quadratic inequality. Graph the solution.v2 + 5v - 14 ? 0
A. [2, ?)
B. (-?, -7]
C. [-7, 2]
D. (-?, -7] ? [2, ?)
Find the limit if it exists. 
What will be an ideal response?