Question

i need to solve this i don't know how he got this d/dt 80=0 d/dt t^2= 2t
i need to solve this i don't know how he got this d/dt 80=0 d/dt t^2= 2t
@Mathematics

Answer 1

derivative of a constant is 0

Answer 2

took the derivative using the power rule
i.e:
\[x^n \prime = nx ^{n-1}\]

Answer 3

that vertical line is supposed to be a prime.