How many different ways can four cars in a train be arranged?

3x^3-x^2+6x-9

idk

step-by-step explanation:

i don't know

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb

42.4 6th grade students prefer hip hop

step-by-step explanation:

40 percent of 106 = 42.4