Wthdrawing $10 every week from an outstanding balance of $400

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

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?

Find the distance between (7,-6) and (-3,-9)