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Theresa invested $5,000 in an account she expects will earn 7% annually. Approximately how many years will it take for the account to double in value?

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solve:

5000(1.07)^n = 10000
1.07^n = 2
log both sides
log 1.07^n = log 2
n log1.07 = log2
n = log2/log1.07 = appr 10.24

It will take appr 10 years

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