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