Question

walter is contracted to pour a concrete slab for the driveway of a new home. the water in concrete can freeze if the outdoor temperature is below 40°f. concrete needs about a week to set. the temperature for the next 7 days will be about 57°f plus or minus 18 degrees. which statement is true?

Explanation:

Step1: Find temperature range

The average temperature is \(57^\circ\text{F}\) with a variation of \(\pm18^\circ\text{F}\). So the minimum temperature is \(57 - 18 = 39^\circ\text{F}\) and the maximum is \(57 + 18 = 75^\circ\text{F}\).

Step2: Compare with freezing temp

The water in concrete freezes below \(40^\circ\text{F}\). The minimum temperature here is \(39^\circ\text{F}\), which is below \(40^\circ\text{F}\). So there will be times when the temperature is below \(40^\circ\text{F}\) during the week, meaning the water in the concrete could freeze. (Assuming the question has options like "The water in the concrete could freeze" etc., but since options aren't given, we analyze the temperature range.)

Answer:

(Assuming the true statement is about the temperature range including below \(40^\circ\text{F}\), e.g., "The water in the concrete could freeze because the minimum temperature in the next 7 days will be \(39^\circ\text{F}\), which is below \(40^\circ\text{F}\)")