Order of operations using "gemdas" the answer is 4 just need on how to solve it (step by step)

Solve |2x - 5| = 4 if anyone could , that would be great

Evaluate the following expression 1/3^2

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.