Compute the value of the discriminant and give the number of real solutions of the quadratic equation. -9x² – 3x-2=0 please help !

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

How do i simply this radical expression?

These dots plots show the height (in feet) from a sample of the different types of elephants