exam Maths Puzzle Numerical Ability

how do you solve disjuction inequalities? also how do you put it in intveral?

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exam Other Question

Explain how you might find a measure of an angle of a staircase that will describe the staircase's steepness. how do you answer this question? (2^4)(2^3) I tink the answer may be negative exponent law = 1/2^1