Answer:
Step-by-step explanation:
F(x)=8(1.25)^x----F(x)= 1000--Plug in known variables----1000=8(1.25)^x--Divide by 8--------125=1.25^x----1.25^21.6377~=125-- Reformat--- 8*1.25^21.6377 close to 1000 could round it to any decimal place you want. Hope this helps