Determine if each function is injective, where trunc(x) denotes the integral part of the real number ofx 4. fx)= l, x er 6. h(a) lg x, x e r+ 8. g(x) la1 , xer 5. g(x) 2", x e r 7. lx) = lx, x er 9. h(x) = trunc(x), x e r 10. f: sw defined by fa) = |a], where s is the family of all finite sets. determine if each function from r to z is surjective. 11. fx)= lx 13. h(x) = [al 12. g(x) lx 14. h(x) lg lx |, x 0 w defined by ord(c) = ordinal number of the 15. ord: ascii character c. 16. letf r r defined by f(x) = ax + b, where a, b e r and a 0. show that fis surjective; that is, find a real number x such that flx) c