13 please help.

10. Find the number of arrangements of the letters of the word EXCEED. 11.a. Represent the premises below symbolically. State what statement each letter you use represents I will be rich or I will be a writer. I will not be rich. 11.b. Find conclusions that may be drawn from the premises in 11.a. For cach conclusion you list, tell what rule(s) of inference and what logical equivalence(s) you used to make the conclusion 12, A relation R is defined on a set A = { 1, 2, 3, 4 } by R = {(1,1), (1, 2), (2, 1), (1,4), (2, 2), (4, l), (4, 4)) A relation on a set A may be reflexive, symmetric, and/or transitive. Tell what each property tion R has the property 13. Solve the recurrence relation an--3an-l +10an-2, al-1, a,-37 14. a. Draw the labeled positional binary tree for the algebraic expression ((k +5)- (3 xm))-(6+ (p x 4))