A cup of coffee contains 100 mg of caffeine, which leaves the body at a continuous rate of 17% per hour. (a) Write a formula for the amount, A mg, of caffeine in the body t hours after drinking a cup of coffee. Explain. (b) Graph this function. Use the graph to estimate the half-life of caffeine. (c) Use logarithms to find the half-life of caffeine.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Derek purchased a new gym membership. it costs him seven dollars a month plus two dollars for every time that he visits the gym. he wants to spend less than 25 dollars a month to visit the gym. write an inequality that models the situation using the variable v for the number of visits per month. also find the maximum number of visits he can make to the gym and still keep his cost below 25 dollars a month.

Ineed with numbers 8,9and10 answer fast i have 10 minutes