A shopkeeper is keen to sell his stock of left handed scissors. He has read hat 9% of the population is left handed. What is the probability that the next person that enters the shop is right handed?

Nine more than four times a number is the same as one less than twice the number. find the number?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

How is working backward similar to solving an equation?