The product of 15 and

is

. This is a linear binomial.

is a cubic trinomial. In your original question, I'm not sure what the

means.
37.9 equals 30+7+.9 you should try to put in number form so you know what you're dealing with
5/6 = 0.833333 .... (non-terminating)
(x+8)(x+8)=64x because 8*8=64 and the x is one so which means it eqaled to 1 so the answer would be 64x