book Maths Puzzle Numerical Ability

could you please help me with this problem:

-8≤2x - 4≤8

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book Other Question

Id any intercepts and asymptotes of the following:

f(x) = 2x-1/x-5
10) The year y when sales were s million dollars for a particular electronics company can be modeled by the radical equation
. . . . . ______
y=1.3/s-4-7 (That is the sqrt s