1. Letf: Z Z be defined by f(x)=x-1. Is finvertible? If yes, find the inverse of no, why? 2. Determine whether the relation R on the set of all people is reflexive, symmetric, antisymmetric, and/or transitive, where (a, b) ER if and only if a is taller than b. 1. - 11. iii. iv. a and b were born on the same day. a has the same first name as b. a and b have a common grandparent 3. Conjecture a simple formula for an if the first 10 terms of the sequence tan) are 3, 11, 19, 27, 35, 43, 51, 59, 67, 75. 4. Evaluate the following 100 k k=35 34 (ii) [[[ (+2/+3k (i)