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It would be 1,200 because you just have to multiply 400 times 3 hope it helped :)
Do the split method, by splitting it in the middle
Factor 3x^3 + 4x^2 and -15x - 20 seperately
x^2 (3x + 4) - 5(3x + 4)
(x^2 - 5)(3x + 4) is your answer
hope this helps
Nine because there's three runners and three places to finish so 3*3=9
