Factor the perfect square trinomial completely.x2 - 20x + 400
A. prime
B. (x - 20)2
C. (x + 20)2
D. (x + 20)(x - 20)
Answer: A
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Find the derivative.y = sin2 9?x
A. 18? sin 9?x B. 18? sin 9?x cos 9?x C. sin 18?x D. 2 cos 9?x
Identify the problem with the method used to obtain a random sample.Denis is interested in the opinions of students at his university regarding life after death. He obtains an alphabetical listing of names of all students at the university. He obtains a sample of 10 students by choosing every 1000th name from the list.
A. Choosing every 1000th name will lead to bias in the sample. Not all of students on the list have the same chance of being selected. B. The sample is too small. C. The sample is biased because the students on the list will not be representative of all students.
Rewrite the expression as a single trigonometric function using a double-angle identity.cos24? - sin24?
A. 2 sin 4?
B. cos 8?
C. 
sin 16?
D. cos 4?
Solve the system.
A. x = 0, y = 1, z = 0 B. x = -1, y = 1, z = 1 C. x = 0, y = 0, z = 1 D. x = 1, y = -1, z = 1