exam Maths Puzzle Numerical Ability

a 7.61cm X 7.68cm rectangular piece of glass has a thickness of 2.2mm and a mass of 35.303g. What is the density of the glass?

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exam Other Question
Perform the indicated divisons:
7x^5y5-21x^4^4+14x^3y^3/7x^3y^3 okay.
i need help with this one..

its called system of linear equations

3x+2y=10.

i have no clue how to do it.