Answer
Please see the graph.
Work Step by Step
The graph was made using graphing software.
$y=-3x^2+18x$
vertex:
$x=-b/2a$
$x=-(18)/2*(-3)$
$x=-18/-6 = 3$
$y=-3x^2+18x$
$y=-3(3)^2+18*(3)$
$y=-3*9+54$
$y=-27+54$
$y=27$
The blue line is the axis of symmetry, and the vertex is labeled.
