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
 

HallsofIvy

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Since this was posted in "beginning algebra", taking the derivative is probably not appropriate. Instead "complete the square".
 

sinx

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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.
 

mmm4444bot

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Denis

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I'm a bit confused, too. Is the second 'ht' above an abbreviation of h(t) ?
"English is the most ambiguous language in the world." ~ Yours Truly, 2018!
 
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