Abook sold 31,200 copies in its first month of release. suppose this represents 8.4% of the number of copies sold to date. how many copies have been sold to date?

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.