1. the sum of the first n odd positive integers is 64. what is the value of n ?

2. marielle buys an equal number of 50 cents and 75 cents candy bars and spends $10, not including tax. how many candy bars did she buy altogether ?

Acollege is selling tickets for a winter fund-raiser. one day, krissa sold 14 adult tickets and 8 student tickets for a total of $376. the next day, she sold 7 adult tickets and 11 student tickets for a total of $272. krissa wanted to find the price of one adult ticket, a, and the price of one student ticket, s. she wrote and solved the following system of equations.