23.5 in expanded form

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

Could someone me with this question i’ve been stuck on it for 20 minutes

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.