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.

The surface area of the gift box that Kira decorates is

Step-by-step explanation:

see the attached figure to better understand the problem

we know that

A cube has six square faces

The surface area of a cube is equal to the area of the six squares faces

where

b is the length side of a cube

In this problem we have

substitute