I need help with quadratics. I have no clue about a) b) c) or d)

#a

Here we do not have a x in the function but we have a t, that's why I have written t-intercept instead of x-intercept.

Write the coefficients of the quadratic equation:

a = -5b= 120c= 0

The discriminant is greater than 0, so the related quadratic equation has 2 real solutions.

#b

identify the coefficients of the quadratic function

a = -5b = 120

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The maximum value is 720 at t=12..

#cTo find this we have replace t with 15

The maximum height it will reach is 675 at t=15..

#d

The domain of a quadratic function is the set of all real numbers

The range is the set of all negative numbers to the maximum vertex