book Maths Puzzle Numerical Ability

When graphing a linear inequality, how do you know if the inequality represents the area above the line?

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book Other Question

Hi,
Could someone please answer this for me
Tell whether a triangle with side of the given lengths 15,15,21.2
is 45,-45,-90 degrees 30,-60,-90 degrees or neither
I gave 45,-45,-90 and the answer was marked wrong.
Thanks Solve the logarithmic equation. Round the result to the three decimal places if necessary.

9log10 x - 4 = 11