8.6E-10 is 8.6 x 10^-10 in standard form. As 'E' represents '10^'
Hope it helped!
You can substitute 20 + d for c in the first equation which gives you
20+ d = 100 - d then solve
2d = 80
d= 40
then put the value for d back into one of the original equations
c= 20 + d
c = 20 + (40)
c = 60
About $80
5.29*16.3=86.227 which is closest to 80
If I could look at the graph and it would really help....
Answer: lump sum investment
Step-by-step explanation: