(03.03) The point R is halfway between the integers on the number line below and represents the number _. (Use the hyphen for negative numbers and write the answer as a decimal, such as -6.4).

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.