Whats is 2+2? and 4x6?

Which graph represents the parent function of y=(x+2)(x-2)

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

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?