Find the focus and the directrix of the parabola.y = x2 + 18x + 82
A. Focus: 
; directrix: y = 
B. Focus: 
; directrix: y = 1
C. Focus: 
; directrix: x = 1
D. Focus: (-9, 2); directrix: y = 0
Answer: A
Mathematics
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Use the 68-95-99.7 rule to solve the problem.At one college, GPA's are normally distributed with a mean of 3 and a standard deviation of 0.4. What percentage of students at the college have a GPA between 2.6 and 3.4?
A. 68% B. 99.7% C. 95% D. 84%
Mathematics
Solve for x: x2 - 25 = 0
a. x = 5, -5 b. x = 25, 0 c. x = 12, 13 d. x = -12, -13 e. x = 0, -25
Mathematics
Answer the question.List all numbers that must be rejected as possible solutions.
= 
A. -17, 
B. 0, -17, 
, 
, 
C. There are no numbers that must be rejected.
D. -17, 
, 
, 
Mathematics
Find the amplitude or period as requested.Find the amplitude of y = 3 cos (2x - ?).
A. ? B. 6 C. 2 D. 3
Mathematics