Maria has $10,000 to invest in two accounts. he decides to invest one part in an account with 5% interest and the rest in an account with 8% interest. at the end of the year he has earned $702,50 in interest.¿how much did maria invest in the 8% account?

she invested $3250 in 5% interest account and $6750 in 8% interest account.

Step-by-step explanation:

Let P be the amount Maria invested in an account with 5% interest , then 10,000-P denote the amount invested in account with 8% interest.

The simple interest on amount P with rate r % in time t is given by:-

Interest in 5% account in 1 year=

Similarly,

Interest in 8% account in 1 year=

According to the question,

Thus, she invested $3250 in 5% interest account and $6750 in 8% interest account.

1. is 4 and 2. is 3

step-by-step explanation:

so if you look at the first one you see that 1 is to 4 and 2 is to 8 and so on, so you can see for every 1 there is a times 4 so if it were 3 then it would be 3*4 and it is 12

for number 2 it is 3 because 1 is to 3 and 2 is to 6 so for every 1 there is 3 so if it were 3 then there would be 3*3 = 9