He has 9 choices for the first role, and that leaves him 8 people to choose for the second so he has 9*8 = 72 choices for the first two roles; that leaves 7 possible choices for the third role so that gives him 9*8*7 choices or 504 different ways he can assign the roles. i think this is correct.
No. She didn't beat the record as she was 0.03 seconds short of beating the 2nd fastest, and 0.07 seconds for the 1st fastest.
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A: x intercept is -2 and y intercept is -3
