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How do you solve 5√2 -4√18 + √36? -3/8-1/2 subtraction? A geometric sequence begins 15, 3, 3/5, 3/25, 3/125,.... Find the common ratio r for this sequence.? additional questions in comments.? Can a Sodium atom make a covalent bond? Can a Carbon atom make an ionic bond? Rationalize the numerator [sqrt(x) - sqrt(x+h)] / [h sqrt(x) sqrt(x+h)]?