need help solving for rates of change

i am trying to solve the position of an object moving in a straight line is given by s(t)=t^3-7t^2+7.  Find the instantaneous velocity when t=4
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1 Answer

???????????? velosity ???????????

the reel werd is SPEED

"velosity" is a vekter.   Yu dont sae nuthun bout vekters

distans=t^3 -7t^2 +7

EVALUATE d at t=4

4^3=64

 t^2=16 & -7*t^2=-7*16=-112

64 -112+7=-41
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