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Howdy my friend

hi :D

What do you need help with?

Right. But there would be more questions concerning that question you just typed.

You know the equation and everything that's great

I have to find the Maximum

Let's graph.

ok

Find the vertex.

That is the point at which the parabola reflects.

Do you have an access to online calculator or would you like me to do it?

I would like you to show me

I am on it just a sec

ok

y=-16t ^ 21+80t+200

Type that into desmos calculator. You should get a vertex of (2.5,300)

It's saying that after 2.5 seconds from the launch the height of the object reaches 300m

Did you get it or not?

yes

so is 300m