Please help If P(6,-2( Q(-2,8) R(-4,3) and S(-9,y) find y so that line PQ is perpendicular to line RS

Part a : solve - vp + 40 < 65 for v . part b : solve 7w - 3r = 15 for r show your work!

What expression is equivalent to log3(x+4)

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2