Pls help I give brainliest to the best

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day

Julie was able to walk 16 km through the zoo in 6 hours. how long will it take her to walk 24 km through the zoo?