Solve the problem.A person puts $20 into a bank account on January 1, $25 on February 1, $30 on March 1, and so forth. How much has the person put into the bank account by December 30?
A. $570
B. $450
C. $600
D. $1140
Answer: A
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Calculate the flux of F across G.F(x, y, z) = 5xi + 5yj + 2k; G is the surface cut from the bottom of the paraboloid 
by the plane 
A. 72? B. 88? C. 16? D. -144?
Determine the population and the sample.Every 75th computer coming off an assembly line is checked for defects.
A. Population: all computers coming off the assembly line; Sample: every 75th computer B. Population: all computers coming off the assembly line; Sample: 75 computers C. Population: 75 computers; Sample: one computer D. Population: every 75th computer coming off the assembly line; Sample: 75 computers
Evaluate the expression for the given values. If necessary, round to the nearest tenth.
x = 9, y = 3
A. 
B. 
C. 
D. 
Add or subtract as indicated.(12x2 - xy - y2) + (x2 + 8xy + 8y2)
A. 11x2 - 9xy - 9y2 B. 13x2 + 9xy + 9y2 C. 13x2 + 7xy + 7y2 D. 12x2 + 8xy + 8y2