Pleaseee helppp meee I am struggling badly

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

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.