Find the sum or difference. Write the answer in standard form.(4 - 7i) + (-8 + 2i) + 2i

A. -2 - 3i
B. 12 - 5i
C. -4 - 3i
D. -4 + 3i


Answer: C

Mathematics

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Use the Gauss-Jordan method to find A-1, if it exists.A = 

A.

B.

C.

D. Does not exist

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Solve.Find the volume of the solid generated by revolving the region bounded by the curve  the  and the vertical line  about the x-axis.

A. ? e B. ?(e2 - 1) C. 2?(e2 - 1) D. ?(e - 1)

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Solve.A number less 8 is -19. Find the number.

A. 11 B. 27 C. -11 D. -27

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Find the product and simplify. Assume all variables represent nonnegative real numbers. ? 

A. 36
B. 18
C. 72
D. 18

Mathematics