Solve the problem.A repair company's charge for repairing a certain type of copy machine fits the model  where y is the number of dollars charged and x is the number of minutes the repair person is on the job. How many minutes would it take for the cost of repair to reach $120? (Round to the nearest minute.)

A. 187 min
B. 118 min
C. 271 min
D. 12 min


Answer: B

Mathematics

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Find the center of mass of a thin plate of constant density covering the given region.The region bounded by y = x2 and y = 9

A.  = 0,  = 
B.  = 0,  = 
C.  = 0,  = 15
D.  = 0,  = 

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Solve. Check for extraneous solutions. + 5 = x

A. {9} B. {9, 18} C. {2} D. {2, 9}

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Use a calculator to approximate the logarithm to four decimal places.ln 

A. -0.1334 B. -0.1335 C. -0.1336 D. -0.0580

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Find the point(s) on the curve where the tangent is horizontal.

Mathematics