Perform the indicated operation and write the answer in lowest terms.
+ 
A. 
B. 
C. 
D. 1
Answer: B
Mathematics
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Express the ratio in simplest form.12 V to 9 V
A. 
B. 4
C. 
D. 
Mathematics
Find the directrices of the ellipse.16x2 + 4y2 = 64
A. y = ± 
B. x = ± 
C. x = ± 
D. y = ± 
Mathematics
Use the midpoint formula to make the requested estimation.The life expectancy for a person living in a certain country born in 1990 was 78.9 years and the life expectancy of a person born in 2012 was 84.3 years. Estimate the life expectancy of a person living in this country born in 2001.
A. 81.6 yr B. 82.95 yr C. 83.6 yr D. 80.25 yr
Mathematics
Solve the problem.Find an equation for the level surface of the function f(x, y, z) = 
that passes through the point 
.
A. x2 + y2 + z2 = 169 B. x + y + z = 13 C. x2 + y2 + z2 = 13 D. x + y + z = ± 13
Mathematics