What is the algebraic expression for the sum of the square of a number and nine times the number?

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be bale to prepare using the sauce?

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$