Write the given statement as an equation.The surface area of a sphere S varies directly as the square of its radius r.
A. S = kr2
B. S = 
C. S = 
D. S = k2r
Answer: A
Mathematics
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Perform the operation and give the answer in the same numeration system. Write the answer as simply as possible.Add 
and 
A. 
B. 
C. 
D. 
Mathematics
Find the difference.- 
- 
A. 
B. - 1
C. - 
D. - 
Mathematics
Solve for x. Assume that a and b represent positive real numbers.x2 - a2 - 81 = 0
A. {
, - 
}
B. {a2 + 81, a2 - 81}
C. {
, - 
}
D. {
, - 
}
Mathematics
Find a decimal approximation of the root or power. Round the answer to the nearest thousandth.221/7
A. 1.555 B. 3.143 C. -154.000 D. 154.000
Mathematics