A beach towel is on sale for 20% off the regular price. The regular price of the beach towel is $15. What is the amount of savings?
RE
20%

it would be 3 dollars in the US

At first I thought it was 2 us won but after going over it again i found it was 3 US Won

Step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

pi x^2

step-by-step explanation:

pi times x squared