9. Write the following statement in its contrapositive, converse, and inverse forms (3 pts): If x is nonnegative, then x is positive or x is 0. 10. Write negations for the following statements (1pts): If P is a square, then P is a rectangle. 11. Rewrite the statement in if-then form in two ways, one of which is the contrapositive of the other (2 pts): Being divisible by 3 is a necessary condition for this number to be divisible by 9. 12. Rewrite the statement in if-then form in two ways, one of which is the contrapositive of the other (2 pts): Sam will be allowed on Signe's racing boat only if he is an expert sailor