Please help me. I don’t know

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

What is 20+(5 x 2/5 )+ 3 show your work

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