How do i solve 9 divide by 10.034

Find dy/dx using implicit differentiation ln(20+e^xy)=y

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?

Find the root(s) of f (x) = (x- 6)2(x + 2)2.