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Answer :
Final answer:
To find the projected daily energy usage at 80 degrees F, we subtract 3 kWh (which is the total energy saved by raising the temperature by 2 degrees at a rate of 1.5 kWh per degree) from the current daily energy usage at 78 degrees F. However, without knowing the current energy usage at 78 degrees F, it is not possible to provide an accurate answer from the given options.
Explanation:
If the thermostat is set at 78 degrees F, and for every degree turned up, daily energy usage drops by 1.5 kWh, we can calculate the projected daily energy usage at 80 degrees F. Turning the thermostat up from 78 degrees F to 80 degrees F means an increase of 2 degrees. If for each degree we turn up the thermostat we save 1.5 kWh, then for 2 degrees we save 3 kWh in total.
Without the exact current daily energy usage at 78 degrees F, we cannot determine the exact usage at 80 degrees F. However, we can infer from the context that for an increase to 80 degrees, there is a saving, indicating less energy used compared to the original setting at 78 degrees F. Given the options provided (A) 38.5 kWh, (B) 39.5 kWh, (C) 42 kWh, and (D) 44.5 kWh, the only logical outcome is that the real daily energy usage number must be 3 kWh higher than one of these options. Since we have a decrease in usage, none of the provided answer choices can be correct based on the given 3 kWh reduction.
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