Question:
A parabola with equation $y=ax^2+bx+c$ contains the points $(-3,3)$, $(1,3)$, and $(0,0)$.  Find the value $100a+10b+c$.

Answer:
Since the points $(-3,3)$ and $(1,3)$ have the same $y$-value, the axis of symmetry of the parabola must be between these 2 points.  The $x$-value halfway between $-3$ and $1$ is $x=-1$.  Therefore the vertex of the parabola is equal to $(-1,k)$ for some $k$ and the parabola may also be written as  \[a(x+1)^2+k.\] Now we substitute.  The point $(1,3)$ gives  \[3=a(1+1)^2+k,\] or  \[4a+k=3.\] The point $(0,0)$ gives  \[0=a(0+1)^2+k\] or  \[a+k=0.\] Subtracting the second equation from the first gives  \[(4a+k)-(a+k)=3-0\] so $3a=3$, giving $a=1$.

Since $a=1$ and $a+k=0$ we know that $k=-1$ and our parabola is  \[ax^2+bx+c=(x+1)^2-1.\] In order to compute $100a+10b+c$ we can substitute $x=10$ and that gives  \[100a+10b+c=(10+1)^2-1=\boxed{120}.\]