9. Which is not a rational algebraic expressions? a, x/x+1 c. 4xY b. 6x d. 3m + 1 10. What value of x is not permissible in the expression 5/x-9 ? a 3 C.-3 b.9 d.-9 11. Simplify 3x + 6 ? X+2 a. X + 3 b 3 c. 1/x+2 d. 1/3 12.Simplify 48b/36? 46/3 c. 4/Bb 6. 36/4 d. 3/6