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you would multiple t by 3000 and minuse it by the original sum(21000)

an example is if t is 2 then the forumal would look like this
V=-3000x2+21,000
v=15000

the year was given previously as 5 years.

12=21-3(11) would get a negative 12 but i need it to be postive

if it was5 years then you would use the original forumila and instead of t you would put 5

yes that would give it 15 years to be the answer

do u understand it now or do u need some more help

21-3(3)=12