A child has an enormous jar in which she has been saving all of her spare change. In order to determine exactly how much money she has in the jar, she dumps all of the coins on the floor and counts them. Under the watchful eye of her mother, she counts 180 pennies, 120 nickels, 100 dimes, and 80 quarters.The sampling proportion in this survey is
A. 100%.
B. 180/480.
C. 80/480.
D. unknown.
E. none of these
Answer: A
Mathematics
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Find the standard-form equation of the hyperbola centered at the origin which satisfies the given conditions.Foci at (-15, 0), (15, 0); asymptotes: y = 
x, y = - 
x
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Mathematics
Simplify. Do not use negative exponents in your answer.(x-6)2
A. 
B. x-4
C. x12
D. 
Mathematics
Find the least common denominator.
, 
A. m(m - 2)(m - 4) B. (m - 2)2 C. m(m - 6)(m - 4) D. m(m - 2)2
Mathematics
Solve the equation for the indicated variable.
n - (7 - a) = 4a for n
A. 20a - 28 B. 12a + 28 C. 0.75a + 1.75 D. 20a + 28
Mathematics