Solve the absolute value inequality. Write the solution set using interval notation.
? 17
A. (-?, 17]
B. (-?, -17] ? [17, ?)
C. [-17, 17]
D. (-?, -17]
Answer: C
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Provide an appropriate response. How many variations of solutions are possible for a system of two parabolic equations?
What will be an ideal response?
Rationalize the denominator. 
A. 
B. 
C. 
D. 
Find all specified roots.Fifth roots of 1.
A. 1, cis 
, cis 
, cis 
, cis 
B. 1, cis 
, cis 
, cis 
, cis 
C. 1, cis 
, cis 
, cis 
,-1
D. -1, cis 
, cis 
, cis 
, cis 
Solve the problem.Robert has built a mechanical model solar system with three balls representing planets at the ends of rods attached to the center representing the sun. The planets are aligned when he turns on the motor. The innermost planet makes a revolution in 12 seconds, the middle planet makes a revolution in 20 seconds, and the outermost planet makes a revolution in 28 seconds. After how many seconds will the planets be aligned again?
A. 210 seconds B. 630 seconds C. 420 seconds D. 840 seconds