You would mutiply 56.25 x 6 and 25.8 x 3 and get 337.5 + 77.4 and the final answer would be $414.9
It's the first one. That is a perfect square polynomial, which, when factored, will give you the same binomial twice, or multiplicity 2. It will factor to

, where the vertex (h, k), is (-9, 0).
Sarah would be incorrect, because the more numbers after the decimal, the smaller the number would be, because it is further away from the number one.