exam Maths Puzzle Numerical Ability

2(b+4)+8b= my work is this correct 2 x b+2 x 4+8b
=2b+8+8b
=18b

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exam Other Question

The time, t, in seconds, for a free-falling object to fall d feet is modeled by the formula t=(d/16)^1/2
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log base square root 2 (2 sqaure root 2)