I need help with #21 ASAP.. I need to get it done…. Show step by step please help me with it and if you can’t answer it don’t do it at all … Don’t answer it to get points

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.

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

What are the exclude value of mn+3m