This polygon has a perimeter of 39 centimeters. What is the length of side A?

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

The ratio of wooden bats to metal bats in the baseball coach’s bag is 2 to 1. if there are 20 wooden bats, how many metal bats are in the bag?