Kaplan Nursing Entrance Practice Exam

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How would 'the sum of two variables x and y' be expressed?

n * m
m + n
m - n
n / m

The correct answer is: m + n

The phrase 'the sum of two variables x and y' indicates an addition operation between the two variables. In mathematical terms, the expression for the sum is represented as x + y. When looking at the answer choice, the phrase 'm + n' mirrors the addition operation described. In this choice, the letters m and n are serving as placeholders, just like x and y would. Therefore, this choice conceptually aligns with the interpretation of summing two variables. The other options do not represent a sum: - The first option, n * m, represents multiplication rather than addition. - The third option, m - n, involves subtraction, which is different from the summation. - The fourth option, n / m, indicates a division operation. In this context, the answer that correctly reflects 'the sum of two variables x and y' is indeed expressed by m + n, as it properly demonstrates the addition of two variables.