exam Maths Puzzle Numerical Ability

How do you add this rational expression: 3x/10 + 9x/10? Whats the answer?

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exam Other Question

can you name the property illustrated by each
1.x + y = y + x

2.k + 0 = k
Find any rational roots for the equation

x to the fourth + 3x squared -8x + 10 = 0