Tom bought 3 boxes of 8 chocolate bars for a party, and laura had 17 bars more. Which equation could be solved to find how many chocolate bars the kid had together? Solve the problem

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.