Simplify the expression use only positive exponents: 1. 8x^2y^-2/x^-2y * (4xy^2)^-1/x^2y

2. 5^-4*5^-5/5^-6

PLZ HELP

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Do some research and find a city that has experienced population growth. determine its population on january 1st of a certain year. write an exponential function to represent the city’s population, y, based on the number of years that pass, x after a period of exponential growth. describe the variables and numbers that you used in your equation.

Find the missing factor. write your answer inexponential form.9^2=9^4×