Arecipe calls for 1/2 teaspoon of salt for the batter and 1/8 teaspoon of salt for the topping. how much salt is used in the entire recipe?

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.