3x + 2y= 9. how do i solve this problem?

Item 8 an account earns simple interest. $700 at 8% for 6 years a. find the interest earned. $ b. find the balance of the account. $

Jack lives on a farm and has a large backyard. the area of his rectangular backyard is of a square mile. if the width of the yard is of a mile, what fraction of a mile is the length of the rectangular backyard?

Weak battery is considered to be a part of routine a. inspection b. wear and tear c. maintenance d. check