What is the result of substituting for y in the bottom equation?

y=x+3

y=x^2+2x-4

A x+3=x^2

B x+3=x^2+2x-4

C y = (x+3) ^2+2 (x+3) - 4

D y=x^2+2x-4 - (x+3)

Factor completely. -2k - k 3 - 3k 2 A: k (-k + 1) (k - 2) B: - k (k - 1) (k - 2) C: - k (k + 1) (k + 2)

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A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

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