Answer:
20
Step-by-step explanation:
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Answer:
The number 1 is not necessary when expressing powers of one. For example, you needn't write "5" as
.
Step-by-step explanation:
After 1 year, the initial investment increases by 7%, i.e. multiplied by 1.07. So after 1 year the investment has a value of $800 × 1.07 = $856.
After another year, that amount increases again by 7% to $856 × 1.07 = $915.92.
And so on. After t years, the investment would have a value of
.
We want the find the number of years n such that

Solve for n :





3/10=4/x
3x=10(4)
3x=40
x=13.33