6. if ad= 20 and ac = 3x + 4, find the value of x. then find ac and dc.
ac
dc

Nine more than four times a number is the same as one less than twice the number. find the number?

How many 2/5s are in 1 and 1/2 plz someone me right now

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?