Apropert company sold 20% more houses in 2007 than it did in 2006. if the company sold 426 houses in 2007 calculate how many houses it sold in 2006

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.