3x <18 x <6 x >6 x <15 x > 54

The tile along the edge of a triangular community pool needs to be replaced? ?

Let u = {q, r, s, t, u, v, w, x, y, z} a = {q, s, u, w, y} b = {q, s, y, z} c = {v, w, x, y, z}. list the elements in the set.a ∩ (b ∪ c)a) {q, s, w, y}b) {q, y, z}c) {q, s, u, w, y, z}d) {q, r, w, y, z}

If f(x)=3 over x+2 - square root x-3 then f(7)=