exam Maths Puzzle Numerical Ability

find the area of a rectangle which shows the answer as a polynomial in descending powers of x. length: 4x+5, width: 4x-1

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Given f(x)=x^2 and g(x)=3x-1, find (f*g)(2) and (g*f)(x)

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with a certain amount of money, a women can buy 10 apples, 15 oranges & 2 water melons.find the max number of oranges that she can buy if she has 6 times the initial amount so that