Are my differentiate answers right?

1.Equation: $\displaystyle f(x)=3ln(3-7x)$

Solution: [tex]f'(x)=(3*-7)*\frac{u'}{u}

=$\displaystyle f'(x)=\frac{-21}{2-7x}$

2.Equation: $\displaystyle f(x)=e^{5x+2}$

solution: $\displaystyle f'(x)=5e^{5x+2}$

3. Equation: $\displaystyle g(x)=7^{x-3}+25$

Solution: $\displaystyle g'(x)=7^{x-3}Log7$

4. Equation: $\displaystyle f(x)=Log3x-Ln3$

Solution: $\displaystyle f'(x)=\frac{1}{x Log3}$

5. Equation: $\displaystyle h(x)=log2(5x+4)$

Solution: $\displaystyle h'(x)=\frac{5}{(5x+4)(log2)}$

6. Equation: $\displaystyle y= Ln \frac{(x-2)^4}{(1+x)^5}$

Solution: Unsure of how to solve

Derivative of

1. Equation= $\displaystyle a^x$

Solution=???

2 Equation= $\displaystyle e^u$

Solution= $\displaystyle a^u*u^1 = u^1*e^x$ or is it $\displaystyle e^u$

3 Equation = $\displaystyle a^u$

solution = ???

4. Find Result

Equation $\displaystyle Ln*\frac{u^4*}{z^6}$

Solution = $\displaystyle \frac{1}{x}*\frac{(u^4*v)(6z^5)-(4u^5)(z^6)}{(z^6)^2}$