Just use the rule for taking the derivatve of a t^n, where a is a constant. The rule is:
d/dt(a*t^n) = a*n*t^(n-1)
Then add up the three terms.
The derivative of 9/t (which is 9*t^-1) is -9t^(-2)
You do the rest
y = 3 t^6 − 7 √t + 9/t
y'=
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