Which of the relations below is not a function? mark that apply.

a) {(-1, -1), (7, 7), (3, 3), (4, 4)}
b) {(6, 3), (6, 4), (6, 9), (6, 12)}
c) {(3, 6), (4, 6), (9, 6), (12, 6)}
d) {(2, -2), (-2, 2) (3, 1), (1, -3)}
e) {(0, 5), (0, 2), (4, 2)}

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step-by-step explanation:

intensity of the vector is v= √37 ≈ 6.08 units and make angle ∡α ≈ 9.46° with east direction

step-by-step explanation:

required vector is consists of the two componentsvx= 2+4=6 units   and vy= 1 unit and vx ⊥ vywe will use pythagorian theorem to find intensity of the vector vv∧2 = vx∧2 + vy∧2 => v = √vx∧2 + vy∧2 = √6∧2 + 1∧2 = √36+1 = √37 ≈ 6.08 unitsthe angle ∡α between vector and east direction we wil find with tanαtanα = 1/6 => α = arc tanα = arc 1/6 => α ≈ 9.46°

hope this