5. The function u: R -> R is defined as u(x) = 3x + 11, and the function v: Z -> R is defined as v(r) = 3r + 11. (a) Find u([3,5)) and v( {3, 4, 5}). (b) Find u-'((2, 7]) and v-'((2, 7]). 6. Is the function h: Z -> Z defined by h(n) = if n 2 0 -n ifn Q according to r(m, n) = 3m5". (a) Find r( {1, 2,3} x {-1, 0, 1}). (b) Find r-' ({}}). (c) Find r-(D), where D = {3, 9, 27, 81, .. .}