exam Maths Puzzle Numerical Ability

using logarithms solve index is 5, radical sign over 125/0.55

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exam Other Question

how do i write this in standard form(8x10to the power 0f 7)+(1x10p of 3)+(5x10)+ (2x1/10)+(9X1/10) Which of the following would be classified as a trinomial?

x2 + 2x
1 - x - x5
3xy
(xy)z
all of these

Thank you =)