About 7.5 gallons of water fill up 1 cubic foot of space. How many gallons of water will fill a pool with dimensions of 3ft by 1.5 foot by 3.5?

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.