How do i know if a positive integer is even based on its prime factorization?

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Write the fraction or mixed number and the decimal shown by the model