exam Maths Puzzle Numerical Ability

I need help to perform the indicated operation

f(x)=x+2 g(x)=x2 -1

I need to find (g of)(x)

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exam Other Question

Please help me answer this question: 3z-5less than or equal to 3z-13 A coffee merchant has coffee beens that sell for $9 p/lb & $12 p/lb. the two types are mixed to to create 100 lb of a mixture to sell for $11.25 p/lb. How much of each type of bean should be used in the mixture?