Answer:
60
Step-by-step explanation:
5²= 10
10x3=30
90-30=60
k = 0 means the parabola has one zero, because the vertex is just on the x-axis. k > 0 means the parabola has none zeros, because the vertex will be above the x-axis and it will not intersect the x - axis.
Their all snakes? i dont what else there is to think of
