You lost 26% on a bad investment. you sell the investment and reinvest in a different stock. what investment return do you need in order to get back to your original amount?

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

For how answer my question this will be the last question can you answer in math subject

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?