What is the greatest integer that is less than 28/5

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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}

What expression is equivalent to (84+16)