A farmer wishes to work out the average milk yield in his herd that consists of an equal number of Ayrshire, Friesian, Galloway, and Jersey cows.Suppose the farmer divides up his herd into the four sub-groups and randomly samples 3 cows from each subgroup. What type of sampling is being used?
A. quota sampling
B. convenience sampling
C. simple random sampling
D. capture-recapture
E. stratified sampling
Answer: E
Mathematics
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A. 
B. 
C. 
D. 
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Solve. Clear fractions first.x + 
+ 
x = 
+ 
x
A. 
B. 
C. 
D. 
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Factor.25a2 + 30ab + 9b2
A. (5a + 3b)2 B. 15(a +b)(a - b) C. 2(5a + 3b) D. (5a + 3b)(5a - 3b)
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Find the standard form of the equation of the following conic section.Circle of radius 
with its center at (-8, 6).
A. (x - 8)2 + (y + 6)2 = 2 B. (x - 6)2 + (y + 8)2 = 4 C. (x + 6)2 + (y - 8)2 = 4 D. (x + 8)2 + (y - 6)2 = 2
Mathematics