Hello, Jonathan!

You are probably entering it incorrectly on your calculator.How long will it take for $1,000 to grow to $5,000

at an interest rate of 3.5% if interest is compounded

a) quarterly

b) continuously

For part a) I used the formula: .

Then: .

. .

Here's one common error . . .

We want: .

We must enter: .

. . . . . . . . . . . . . . . . .

When we press , the display shows: .

. . It automatically supplies the left parenthesis.

After we have entered the , we must close the parentheses with

If we don't, we will have: .

. . which the calculator interprets as: .