How do i do this? (3x^2++1) so first i add like terms? 5x^2 + 8 + 1

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.

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?