Please help write these into algebric expressions... 1) 18 is less than x is at most 42.
2) The product of z and 5 is less than or equal to 27.
3) The quotient of x and 2 is no more than 50.

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.