exam Maths Puzzle Numerical Ability

evaluating a logarithm log 0.0837

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exam Other Question

find the volume of a box that is 6 ft deep, 12 ft long, and 8 ft tall? solve by factor completing the square
x^2 - 8x+10=0
x^2 - 8x= -10
(8/2)^2= 64/4= 16

x^2 - 8x + 16=-10 +16
what else to do after this step?