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S=n*(2a+(n-1)*d)/2. make n the subject
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15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m
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Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.
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S=n*(2a+(n-1)*d)/2. make n the subject...
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