Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.

I’m stuck on this equation, anyone got the answer?

The probability that a tutor will see 0, 1, 2, 3, or 4 students is given below determine the probability distribution's missing value.

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6