Can I get the answer for 3 4 5 6

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

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?

Afurniture store is having a weekend sale and is offering a 20% discount on patio chairs and tables the sales tax on furniture is 6.25%