a. y= (3/2)x^2?
If so, do you know the formula for the derivative of x^n: (x^n)'= nx^(n-1). That's usually one of the first formulas you learn.
b. y= ln(x^3+ x)?
Use the fact that the derivative of ln(x) is 1/x and the chain rule.
c. y= e^x/ln(3x)?
Use the fact that the derivative of e^x is e^x and the quotient rule.