The value of 4.2 X 10 to -3 power is 0.0042
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It is: 9.43*10-3 = 0.00943
When m is 7, (6m + 3) is (42 + 3) = 45.(45)3 = 91,125
It is: 3*3*3 = 27
If you mean: 3(2+4x) = 42 then the value of x works out as 3
The value of -3 to the second power is 9.