Connexus algebra 2b chaos theory portfolio

I really need some help

For g(x) = 5x - 3 and h(x) = [tex]\sqrt{x}[/tex], find (g · h)(4)

What is the gcf of 20c^3-5c^4+30c^6

You went to a restaurant and spent $53.25 on the meal. there was a 6% sales tax. what was the amount of money, not including a tip, you spent at the restaurant?