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join please, btw no spaces

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

Ineed i been stuck on this question since yesterday

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?