Help ASAP! I’m confused

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

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.