Help 15 POINTS FOR AN ANSWER

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

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?

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost