Hello everyone. I have this statistics question, but I don't what the exact answers are. Could you please solve it by explaining step-by-step. Thank you all.

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Given the graphed function below which of the following orders pairs are found on the inverse function

Which expression is the factorization of x^2+10+21