book Maths Puzzle Numerical Ability

Could you please show me all steps taken to obtain an answer for the following word problem:

A manufacturer makes silver rings and bracelets. Rings require 5 grams of silver and

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Hello!
I really need help understanding polynomials. Could someone help me undestand how to factor this problem?

15x^2-1x-2

Thank very much! Someone please help me>>>>>>

I need to learn how to simplify the following

(3-sqrt4)*(3+sqrt4)

Thanks