Solve the problem.Sergio's internet provider charges its customers $15 per month plus 6¢ per minute of on-line usage. Sergio received a bill from the provider covering a  period and was charged a total of $97.80. How many minutes did he spend on-line during that period? (Round to the nearest whole minute, if necessary.)

A. 1038 min
B. 380 min
C. 1205 min
D. 38 min


Answer: B

Mathematics

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Find all the first order partial derivatives for the following function.f(x, y) = x3 - 4x2y - 6xy3

A.  = 3x2 + 2xy - 6y3 = -4x2 + 3xy2
B.  = 3x2 = -4x2 - 18xy2
C.  = x2 - 4xy - 6y3 = -4x2 - 6xy2
D.  = 3x2 - 8xy - 6y3 = -4x2 - 18xy2

Mathematics

Find the center of mass of a thin plate covering the given region with the given density function.The region between the curve y =  and the x-axis from x = 1 to x = 9, with density ?(x) = 

A.  = 5,  = 
B.  = 5,  = 
C.  = 6,  = 
D.  = 5,  = 

Mathematics

Write decimal notation.

A. 2.4088 B. 0.024088 C. 24.088 D. 0.24088

Mathematics

Graph the equation.x2 = 20y

A.

B.

C.

D.

Mathematics