What is the equation of the tangent line at x = 1  $of$   $f\left(x\right)=\ \sqrt{x}$  

Write the equation of the normal line of:  $f\left(x\right)=2x^2-\frac{1}{x}$  at x = 1

Find the slope of the Normal line to: $f\left(x\right)\ =\ \frac{4\sqrt{x}}{5}$  
at x = 16

Find the equation of the tangent line at the point (-1,1) of: $f\left(x\right)\ =\ x^4$  

Find the equation of the normal line at x = 0 of:
 $f\left(x\right)\ =\ x^3+e^x$