Question 43410
x(x+4)-x(x+2)=(x+4)-11 or x~2+4x-x~2-2x=x+15 or 4x-2x-x=15 or x=15

proof 15*19-15*17=19+11 or 285-255=30 or 30=30

18000x=206+16000(x-.008) or 18000x=206+16000x-128 or 2000x=206-128 or 

2000x=78 or x=.039 or 3.9% for the 18000 investment & 3.9%-.8%=3.1% for the 

16000 investment