Posted by alison on .
Find the critical number of the function.
g(t) =  6t  9 
t =

pre calc 
MathMate,
a critical number of a function f(x) is where f'(x) is zero or undefined.
Do you see a point where f'(x) is undefined? If not, have your calculator plot the graph. Where it shows a sharp corner, the derivative is undefined.