Please help and show work. I'll give the brainiest and thanks and five stars to correct answers. this is the equation but see pic for details x^2+8x+9

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

Guys i really need or i have to stay late up night

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.