What is the first step in simplifying the expression
11x-2-3(1-7x)^2÷(x+1)

Can someone me and do the problem plz so i can understand it more better

Marcus and cody both leave the park at the same time, but in opposite directions. if cody travels 6 mph faster than marcus and after 4 hours they are 64 miles apart, how fast is each traveling? solve using rare times time = distance.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)