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The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

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