exam Maths Puzzle Numerical Ability

how do i write this in standard form(8x10to the power 0f 7)+(1x10p of 3)+(5x10)+ (2x1/10)+(9X1/10)

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exam Other Question

1/a - 3 - 1/a + 3 + 2a/a^2 - 9 using logarithms solve index is 5, radical sign over 125/0.55