last year maya had $10000 to invest. she invested some of it in an account that paid 7% simple interest per year and she invested the rest in an account that paid 5% simple interest per year. After one year, she received a total of $680 in interst. How much did she invest in each account?

a is the right answer

, 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

answer: #1 ads up by 8 and i don't know #2

no

step-by-step explanation: