exam Maths Puzzle Numerical Ability

How do I find the slope? x=4

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exam Other Question

find the inverse
1 2 3
0 2 4
0 0 3 ADDING AND SUBBTRACTING RADICALS
HOW TO:
16 (square root)10 + 2 (square root)10
(SQUARE ROOT)5 - 3 (SQUARE ROOT)5
(SQUARE ROOT)3 (SQUARE ROOT)2 + 2 (SQUARE ROOT)3)