There are a lot of numbers you can think of, for example, 1030, or even 9939, but I don't recommend you put that ;)
Y = -1/3x + 4 . 4 is the intercept -1/3x is the slope
25 cubic inches because you know that every cone is a third of the volume of the cylinder with which it shares a height and base with.
7/8 equals 0.875
80% equals 0.8
Which means that 7/8 is greater than 80%
-5x(x+3)-7(x-3)/x^2-9= -5x^2-15x-7x+21/x^2-9= -5x^2-22x+21/x62-9