sharon has at most $25 to spend on her sister's birthday gift. she already bought a knitting machine for her, which cost $14.99. she would also like to get her sister some skeins of yarn to go with it. each skein costs $2.75. write an inequality to represent this problem. use y to represent the number of skeins of yarn. what is the most number of skeins sharon can afford to buy? justify your answer in two or more complete sentences.