exam Maths Puzzle Numerical Ability

Graph the set {x|<_ x <_ 5 on a number line (-7 through 7). Also write the set using interval notation



NOTE: <_ means less than or equal to.

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exam Other Question
1.How many quarts of pure alcohol must be added to 10 quarts of a 15% alcohol solution to obtain a mixture which is 25% alcohol? All percentages are by volume For f(x) = 1/x^2-2x-8, find the interval(s) where f(x)<0.

possible answers:
(-4,2)
(-2,4)
(2,4)
(2,8)

Please show me an example how to perform this operation. Thanks