Please help for brainliest.

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?

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20