PLEASEE HELP AND SHOW WORK IF YOU CAN

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

If 3x+8=3x+8 is it one solution or no solution

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.