Nine subtracted from four times a number is -21 what is the number?

Which is the completely factored from of xy^3-x^3y

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Find the coordinates of point x that lies along the directed line segment from y(-8, 8) to t(-15, -13) and partitions the segment in the ratio of 5: 2.