If the two lines below are perpendicular and the slope of the red line is - what is the slope of the green line?
10
15
10

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

What is the factored form of the following expressions? d^2 – 13d + 36