book Maths Puzzle Numerical Ability

Solve and check the equation 6 - (-5r) = 5r - 3

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book Other Question

Let Pn[X] be the vector space of all polynomials of degree <=n, prove that the set (1,x,x(x-1),x(x-1)(x-2),...,x(x-1)(x-2)***(x-n+1)) is a basis for this vector space.

i know th describe how would you calculate the sales price of an item.use a specific example to demonstrate your method.