3x2 + 4x – 15 = (x - 2)(x + e)

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 value of x in the diagram below?

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls