6. If P(6, -2). Q(-2, 8). R(-4, 3), and S(-9, y). find the value of y' so that PQ is perpendicular to RS.

If myesha works overtime, she gets paid "time and a half" for every hour she works. in other words, for every hour over 40 hours myesha works each week, she gets her hourly pay plus half her hourly pay. what is myesha's pay per hour when she works overtime?

What is the range? can’t seem to find it out

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