A cup of hot water is left out to cool. The water is currently 86°C above room temperature. If the heat difference decreases by 10% every minute, what will the difference be in 7 minutes?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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.

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of