Hello Can someone please help me with the following questions:

21a) Use the formal definition of the derivative to find the

derivative of

y=5x² at x=1.

Differentiate the functions given in Problems 1-22 with respect to

the independent variable.

3.f(x)=2x⁵+7x4

In Problems 1-16, use the product rule to find the derivative with

respect to the independent variable.

5.f(x)=(1/2x²1)(2x+3x²)

In Problems 49-70, differentiate with respect to the independent

variable.

49.f(x)=3x1/x+1