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