See the AnswerĪnswer: (D) The relationship cannot be determined from the information given. To solve, cross-multiply to get 71x + 71 = 70x + 75. Substituting this information into the formula gives: In this formula, 71 is the average, 70x + 75 is the total, and there are x + 1 days. Next, use the average formula to find the value of x: The sum of the high temperatures, including the additional day that has a temperature of 75 degrees is, therefore, 70x + 75. If the average high temperature for x days is 70 degrees, then the sum of those x high temperatures is 70x. (D) The relationship cannot be determined from the information given. The addition of one day with a high temperature of 75 degrees increases the average to 71 degrees. The average (arithmetic mean) high temperature for x days is 70 degrees.
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