Find the directrices of the hyperbola.81y2 - 64x2 = 5184
A. x = ± 
B. y = ± 
C. y = ± 
D. y = ± 
Answer: B
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Find the curvature of the curve r(t).r(t) = (10 + ln(sec t))i + (4 + t)k, -?/2 < t < ?/2
A. ? = -cos t B. ? = 1 - cos t C. ? = cos t D. ? = sin t
Verify the identity.sec2 
= 
What will be an ideal response?
List all numbers from the given set that are members of the given Real Number subset.
Irrational numbers
A. 
, 
, 0.26
B. 
C. 
, 0.
D. 
, 
, 0.
Conduct a survey to determine the major worry of school teachers. ?
A. 1. Do you sometimes feel worry?2. When do you usually feel worry?3. What usually appears to be a reason of these feelings?? B. 1. Do you have a pet?2. What is it?3. What is it's name?? C. 1. Do you use the internet ?2. Do you find it expensive?3. Where do you usually use the internet?? D. 1. Where do you usually buy food?2. How often do you visit big supermarkets?3. What is the mean price of your purchase?? E. 1. Do you entrust to your president?2. Did you vote for him (her)?3. Can you name his decision, that you don't appreciate??