Solve the problem.The annual rainfall in Maine is a random variable with probability density function defined by 
for x in 
Find the standard deviation.
A. 1.265
B. 0.903
C. 1.270
D. 1.597
Answer: A
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Find the zeros of the quadratic function by completing the square. List the x-intercepts of the graph of the function.f(x) = x2 - 
x - 
A. x = 
, x = 
B. x = - 
, x = - 
C. x = - 
, x = 
D. x = 
, x = - 
Solve the problem.Suppose that the average monthly low temperatures for a small town are shown in the table.
Model this data using f(x) = a sin(b(x - c)) + d.
A. f(x) = 23 sin 
+ 42
B. f(x) = 42 sin 
+ 23
C. f(x) = 23 sin 
+ 42
D. f(x) = 23 sin 
+ 42
Find the equation of the parabola determined by the given information.Vertex at (7, 8), directrix y = 6
A. x = 
y2 - 
y - 
B. y = 
x2 - 
x + 
C. y = 
x2 - 
x - 
D. x = 
y2 + 14y + 113
Answer the question.List all numbers that must be rejected as possible solutions.
+ 
= 
A. 0, - 
, 
B. - 
, 
C. 0, - 
, 
, 20
D. - 
, 
, -20