address all the questions and show work please 1- For the function f(x)=x^{2}-5x+6, find the slope of the secant line betweenx=-1andx=5. 2- For the functionf(x)=x^2 +6,find the slope of the tangent line atx=-7 3- For the functionf(x)=9x^{2}-6x-11, find the equation of the tangent line atx=6