For the funtion f(x)=6x^2, make a table of slopes of secant lines and make a conjecture about the slope of the tangent line at x=2.
(1,2)=
(1.5,2)=
(1.9,2)=
(1.99,2)=
(1.999,2)=
It can be conjectured that the slope of the tangent line at x=2 is what?