- If a rhombus is a quadrilateral with how many congruent sides?

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How to find calculate concentration? What does science say about what started- or what happened before- the Big Bang? Any theories? R is the the relation on the set A = {1, 2, 3, 4} defined by aRb if and only if |a - b| = 1.
a) Find the matrix representing R.
any help? Can someone please help me with physics?
how long with it take a 1.5kW motor to lift a 400kg piano to a sixth story window 32m above? How do you find the oxidation number of elements in a redox equation in order to find out what was oxidized and what was reduced?

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