exam Maths Puzzle Numerical Ability

10 ln 100 x -3 =117

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exam Other Question
simplify -5 + 7i/7i expressed as a + bi I am not good at simplifying when it comes to multiplying

Square root of 7 x square root of 14

and
(2x square root 2x)(3 square root 5x)

and
square root of 7 (5 square root 5-3 sqaure root 7)

Thanks a million