Please help me if you can it is appreciated

What is the standard form of -5x^2+2x^4-11+x^3+3x

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

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms