Roll a dice what is the probability to get a number less than 4​

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?

What is the value of the discrimination for the quadratic equation 0=×2+2+×2