7844=7400(1+(8/12)r)
Solve for r
R=0.09*100=9%
Let the number be represented by x
2x=60+ 5x -20*2=60+5*-20
2x-5x=5x-5x+60 -40=60+-100
-3x=60 -40=-40
-3x/-3=60/-3
x=-20
Therefore the number is -20
Slope of segment here = 4/8 = 1/2
slope of perp needs to equal -2
midpoint of segment = (3,-1) so include that as a point:
y = -2(x-3)+1
(y- (-1)) = -2(x-3)