Multiply the complex numbers and simplify powers of i.5i(9 - 4i)

A. 45i - 20i2
B. 45i - 20
C. 45i + 20i2
D. 20 + 45i

Answer: D

Mathematics

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Perform the indicated operation and simplify. Assume all variables in the radicand are greater thanor equal to zero.( + )( - )

A.  +  +  - 2
B.  +  -  + 2x
C.  +  -  - 2x
D.  +  +  + 2

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Find the y-intercept for the graph of the quadratic function.f(x) = (x + 3)2 - 9

A. (0, -6) B. (0, 6) C. (0, 0) D. (9, 0)

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Find the measure of the angle.?YZW

A. 115° B. 120° C. 130° D. 110°

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Write the English phrase as an algebraic expression. Let x represent the number.The sum of a number and 131

A. 131x B. 131 C. 131 - x D. 131 + x

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Mathematics