Estimate 543-358 then find the difference

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?