Using Green's Theorem, compute the counterclockwise circulation of F around the closed curve C.F = - 
i + 
j; C is the region defined by the polar coordinate inequalities 6 ? r ? 10 and 
A. 0
B. 128
C. 136
D. 40
Answer: D
Mathematics
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Determine the vertex, focus, and directrix of the parabola and sketch its graph.x2 = 5y
A. vertex: (0, 0)
focus: 
directrix: y = - 
B. vertex: (0, 0)
focus: 
directrix: x = 
C. vertex: (0, 0)
focus: 
directrix: y = 3
D. vertex: (0, 0)
focus: 
directrix: y = - 3
Mathematics
Answer the question.True or false: A rectangle is a trapezoid.
Fill in the blank(s) with the appropriate word(s).
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Without graphing, determine whether the graph of the quadratic function opens up or opens down.f(x) = x2 + 4
A. opens up B. opens down
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Write the number as a decimal.2.9135 × 107
A. 2,913,500 B. 203.945 C. 29,135,000 D. 291,350,000
Mathematics