Question

Isabella save to Nichols a day if she doubles the number of nickels she says each day how many days in cluding today will it take her to save more than 500

Answer 1

Answer:

9 days

Step-by-step explanation:

Given isabella saves a nickel a day.From this day onwards she kept on incresing the savings by doubling them.

Here it form's a geometric progression with first term(a) = 1 and common ratio (r) = 2

S(n) = $a(\frac{r^{n}-1 }{r-1} )$

Given condition is S(n) >500

$\frac{2^{n}-1 }{2-1}>500$

$2^{n}>501$

n ≥ 9

So it will take 9 days for her savings to be more than 500