Compute the following derivatives using the derivative rules. No need to simplify, but please show enough work that we can see how you are applying the derivative rules. Please put your final answer in the box.

$($a$)D_x(3x^5-2x^3+4x-3)=$

$($b$)D_x((x^2+x+1)(x^4-x^3+6x))=$ Hint: Use the Product Rule instead of multiplying out.

$($c$)D_x(\frac{x^2-2x+9}{x^3-4x})=$