Early introduction to calculus, for beginning-algebra students

sinx

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A small marshmallow is launched straight up in the air with a slingshot. Its height h in meters, relative to te ground, is given by the function h(t) = 5 + 20 - 5t^2, where t is measured in seconds. About when does the marshmallow reach its maximum height?

hint; max ht is when velocity=0.
v=dh/dt.

and as said previous you are missing a t.
h(t) = 5 + 20t - 5t^2
 
Since this was posted in "beginning algebra", taking the derivative is probably not appropriate. Instead "complete the square".
 
Since this was posted in "beginning algebra", taking the derivative is probably not appropriate. Instead "complete the square".

i'm confused.
If you set h(t)=0 and solve for t, you will get two times when ht =0.
 
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