Find the perimeter in simplest form and explain your work

Will mark brainliest question in the pic.

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?