Can you me answer this? i know it's hard but someone must

K.

Step-by-step explanation:

The equation we are given (−at2+bt+c) is a parabola and we are told to describe what happens when we change c (the y-intercept).

From what we know about functions and function translations, we know that changing the value of c will shift the entire parabola upwards or downwards, which will change not only the y-intercept (in this case called the “h intercept”), but also the maximum height of the parabola as well as its x-intercept (in this case called the t intercept). You can see this in action when we raise the value of the y-intercept of our parabola.

Options I, II, and III are all correct.

Our final answer is K, I, II, and III