Solve the system by elimination.-7x - 6y = -13-3x + 3y = -39

A. {(7, -6)}
B. {(6, -5)}
C. ?
D. {(7, -5)}


Answer: A

Mathematics

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A. y = 
B. y = - , - 
C. y = , - 
D. y = - , - 

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Find the circumference of the circle. Use 3.14 or  for ? as indicated.Find the circumference. Round the answer to the nearest tenth of a unit.

A. 50.2 mi B. 3215.4 mi C. 201.0 mi D. 100.5 mi

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Solve the problem.A thermometer reading  is placed inside a cold storage room with a constant temperature of  If the thermometer reads  in 11 minutes, how long before it reaches  Assume the cooling follows Newton's Law of Cooling:   U = T + (Uo - T)ekt.(Round your answer to the nearest whole minute.)

A. 63 minutes B. 22 minutes C. 4 minutes D. -20 minutes

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Differentiate.f(x) = 

A. f'(x) = 
B. f'(x) = 
C. f'(x) = 
D. f'(x) = 

Mathematics