book Maths Puzzle Numerical Ability

slove this inequality 3p-16<20

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book Other Question

using the foil method find the product.(x+3)(x2-2x+6)
then i got x3+-6x2+-36x+18 as my answer but my book got x3+x2+18
can u show me how they got that answer or what i did wrong solve 2y-x=5 if the domain is {-3,-1,5,9}