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Numerical Response problems are answered by entering a number and an optional unit. For instance, a numerical response problem might have an answer of 2m/s2. Formula Response problems are answered by entering a mathematical formula. For instance, a formula response problem might have an answer of x2+11. The answer may be in any equivalent format. For instance, for x2+11, the system will also accept x*x+11 or x2+21-10.