Which pair of ratios form a proportion

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

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

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?