Asum is invested at 4% continuous interest. this means that its value grows exponentially with k equaling the decimal rate of interest. find, to the nearest tenth of a year, the time required for the investment to double in value.

T = 72/4 = 18years

T = 20years (to the nearest tenth)

Step-by-step explanation:

Using the rule of 72, which is used to estimate the number of years for a given investment to double at a given interest rate.

Doubling time = 72/interest rate

T = 72/r

Rate r (in percentage) = 4%

Time T (in years)

T = 72/4 = 18years

T = 20years (to the nearest tenth)

Hello there!

You have 20 books

You take away 5

Take away means that there is something being removed. in Math, we used the subtraction sign.

Thus,

20 - 5 = 15

Therefore,

There are 15 books left.

I hope this answer helps! As always, it is my pleasure to help students like you!