book Maths Puzzle Numerical Ability

Simplify 4th sqrt16(a-1)^12

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I've boggled my brain on this:

Projections from the US Department of Commerce show that the number of internet users (in millions) is approximately 11.2x-49.5, where x=0 corresp Solve: 4 - 3(2p + 1) = 3p + 11