exam Maths Puzzle Numerical Ability

please help me with this equation.thanks so much

If log 2=.3010 log3=.4771, find the numerical value of x in 3^x+2=405.

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3 space 3 space 3 space 3 space = 15 Using the Gauss-Jordan elimination on the following linear system, what would the augmented matrix be?

3w-x=2y+z-4
9x-y+z=10
4w+3y-z=7
12x+17=2y-z+6

The way I have tried t