3x^3+21x^2+6x+42

a- (7x+1)(3x+6)
b-(3x+7)(x+1)
c-(x+7)(3x^2+6)
d-(7x^2+1)(x+6)

Which is the completely factored from of xy^3-x^3y

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Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.