Como convertir 18/5 en # mixt . ayudenme porq no s convertir en # mixto

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Free points also plz look my profile and answer really stuff