Karin took a total of 18 quizzes over the course of 2 weeks. after attending 3 weeks of school this quarter, how many quizzes will karin have taken in total? assume the relationship is directly proportional.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?