I need help really badly

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

Rewrite the polynomial -9x5 + 36x4 + 189x3 in factored form.

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is