Plz help i will give 30 points

What is the vertex form of f(x) = x2 + 6x + 3

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

X^2/100+y^2/25=1 the y-intercepts are at: a) (-10,0) and (10,0) b) (0,10) and (0,5) c) (0,-5) and (0,5)