book Maths Puzzle Numerical Ability

find f(-x) for sqrt x^2-x

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I dont understand

1.10^t = 1.4641 (1.10to the power of t (^=power of)) Can you help me solve this for me?
Finding the measures of angles.
Two lines that are parallel, a line going diagonal thru them.
(a) on one side in the corner and (b) on