A point P(r, ?) in polar coordinates is given. Determine the rectangular coordinates P(x, y).(-3, -135°)
A. 
B. 
C. 
D. 
Answer: A
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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
Solve the problem.Write an expression for the area of the larger rectangle below in two different ways.
A. y(3y + 18); 3y2 + 18y B. 2y(6y + 36); 12y2 + 72y C. 18(3y + y); 72y D. 3y(y + 18); 3y2 + 54y
Identify a, b, c, with a > 0, for the quadratic equation.4x2 = 10 - x
A. a = 4, b = -1, c = 10 B. a = 4, b = 1, c = -10 C. a = 4, b = 0, c = -10 D. Not quadratic
250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.Approximately what percentage of the test scores had standardized values between -3 and 3?
A. 95% B. 68% C. 99.7% D. 50% E. none of these