PLZZ HELP DO QUESTIONS 2,3, and 4, or atleast some of them i have question 1 done

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

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

What can each term of the equation be multiplied by to eliminate the fractions before solving? x – + 2x = + x 2 6 10 12