Simplify the numerical expression below.(-85 + 45) + 85 

A. 45
B. 125
C. 215
D. -45
E. none of these

Answer: A

Mathematics

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Find an equation of the circle satisfying the given conditions.Center at (0, 0), radius 3

A. (x - 1)2 + (y - 1)2 = 3
B. x2 + y2 = 
C. x2 + y2 = 3
D. x2 + y2 = 9

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Evaluate the integral.dx

A.  - 3 tan-1 x +  ln(x2 + 1) + C
B.  - ln - 3 tan-1 x +  ln(x2 + 1) + C
C.  - ln  +  ln(x2 + 1) + C
D.  - ln - 5 tan-1 x + ln(x2 + 1) + C

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Find numbers a and b, or k, so that f is continuous at every point. 

A. a = 1, b = 2 B. a = -1, b = 2 C. a = 1, b = -2 D. Impossible

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Subtract. Use borrowing, if necessary.

A. 54,895 B. 45,889 C. 45,789 D. 45,895

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Mathematics