exam Maths Puzzle Numerical Ability

EVALUATE: a-13 when a =33

2 =3y when y=8

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exam Other Question

Write an equation that best models the datd:
x- -2,0,2,4
y- 3.5,7,14,28
in the fraction 3/*, * may not be substituted by which of the following sets?
a) {1,2,4} b) {-2, -3, -4} c) {1,3,7} d) { 0, 10, 20 } e) { 1.8, 4.3}

help me.......thanks in advance