Guys, I need help with my khan academy assignments so there will probably be more questions asked BUTTT- I'm really trying to pass these assignments to help get my grade up.

Which is f(5) for the function –2x2 + 2x - 3?

What is the sum of these mixed numbers 4 2/3+ 3 1/9

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}