Solve the problem.Find the center and radius of the sphere with equation 3x2 + 3y2 + 3z2 - 2x + 2y - 9 = 0
A. center = 
; radius = 
B. center = 
; radius = 
C. center = 
; radius = 
D. center = 
; radius = 
Answer: C
Mathematics
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Find the intervals on which the function is continuous.y = 
A. continuous on the interval [
, ?)
B. continuous on the interval [-
, 
]
C. continuous on the intervals (-?, -
] and [
, ?)
D. continuous everywhere
Mathematics
Solve the equation.log x = -2
A. -20 B. -0.2 C. 0.01 D. -2
Mathematics
Simplify the expression. Express the answer so that only positive exponents occur. Assume that all variables are positive.(9x1/3 ? y1/3)2
A. 81x1/6y1/6 B. 81x2/3y2/3 C. 81x2y2 D. 81x1/9y1/9
Mathematics
Fill in the blank with one of the words or phrases listed below. 
The 
is the basic unit of capacity in the metric system.
A. meter B. perimeter C. liter D. gram
Mathematics