What is the logarithmic form of 81=3^4

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Write an equation for the function that includes the points (2,100)and (3,100)

Without any equipment, you can see stars that are 2{,}800{,}0002,800,0002, comma, 800, comma, 000 light-years away. by looking through a small telescope, you can see stars that are 3{,}112{,}000{,}0003,112,000,0003, comma, 112, comma, 000, comma, 000 light-years away. approximately how many times as far can you see using a small telescope as without any equipment?