book Maths Puzzle Numerical Ability

when can you measure inside the triangle to determine the height?

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book Other Question

Addition seems simple enough to me, but the minus/negative numbers confuse me on factoring.

x2 - 6x - 3 = 0
the chocolate factory Blends it double-dark-chocolate fudge, which is 35% fat, with its peanut butter fudge, which is 25% fat, to obtain double-dark -peanut fudge, which is 29%fat.