Find the directrices of the ellipse.36x2 + 25y2 = 900
A. y = ± 
B. x = ± 
C. x = ± 
D. y = ± 
Answer: A
Mathematics
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Evaluate the expression.
A. 6
B. 2
C. 2
D. 
Mathematics
Perform the arithmetic.-7z - 10z - 2z
A. -19z2 B. 19z C. 19z2 D. -19z
Mathematics
Consider the given points P and Q. a. Find 
b. Find the magnitude of 
c. Find two unit vectors parallel to 
P(4, 13, -2), Q(-1, 14, 8)
A. a. 
;
b. 
c. 
, - 
B. a. 
;
b. 5
c. 
, - 
C. a. 
;
b. 3
c. 
, - 
D. a. 
;
b. 
c. 
, - 
Mathematics
Answer the question.Consider the numbers 
, -9, -1, 
, 
, 0.
, 0.83. Which are irrational numbers?
A. 
, 0.
B. 
C. 
, 0.
D. 
Mathematics