Camila makes and sells jewerly. she has 8,160 silver beads and 2,880 black beads to make necklaces. each necklace will contain 85 silver neads and 30 black beads. how many necklaces can she make?

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.