An exam consists of 15 true-or-false questions. if a student guesses at every answer, what is the probability that he or she will answer exactly 9 questions correctly? (round your answer to three decimal

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.