Please help!! (Math Homework Attachment)

What is the equation of the graph that represents f(x)=x^4 stretched vertically by 2 and shifted up 3 spaces

What is the range for 31,39,29,34,37,24,36,33,34,28

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax