Determine the domain of the expression. Write the domain in interval notation.
A. (-?, ?)
B. (-?, 5) ? (5, ?)
C. (-?, -5) ? (-5, ?)
D. (-?, 9) ? (9, ?)
Answer: B
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Solve the problem.The area of a circle is found by the equation A = ?r2. If the area A of a certain circle is 36? square centimeters, find its radius r.
A. r = 6? cm
B. r = ± 6 cm
C. r = 6 cm
D. r = 6
cm
Find the center of mass of a thin plate of constant density covering the given region.The region in the first and fourth quadrants enclosed by the curves 
and 
and by the lines 
and 
A. 
= 0, 
= 
B. 
= 
, 
= 0
C. 
= 
, 
= 0
D. 
= 
, 
= 0
Collect like terms.5x4 + 7x3 - 7x4
A. 5x3 B. 5x11 C. -2x4 + 7x3 D. Can't be simplified
Write an equation to describe the relationship and solve the problem.y varies inversely as x. If y = 2.1 when x = 0.7 , find y when x = 3.
A. y = 
; 0.49
B. y = 
; 0.07
C. y = 
; 4.9
D. y = 1.47x; 4.41