Linear Inequalities Unit Test answers please I cant figure out almost all of it im from pearson online academy and ive been studying for weeks but still dont understand the material

Find the missing factor in exponential form 48^2=3^2 • ?

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?