exam Maths Puzzle Numerical Ability

how do you write 31.3 x 10^6 in standard notation?

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exam Other Question

I need the 2 part solution to this absolute value problem:

|-9x+8| = |5x+8|

Thank you which of the following CANNOT be the average ( arithmetic mean) of four positive even integers

A)1
B)2
C)6
D)9
E)12