Why is the statement incorrect that probability can be used to predict the result of an activity?

On a piece of paper graph f(x)=5•(0.4)^x

Which expression will have the same sum as 3_8 + 1/4?

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.