A local landscaping company charge $15 per hour to mow your yard they also charge a flat fee of $10 for gas at how many hour will it cost you.$85 for them to mow your yard

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.