Subtract the following numbers to obtain the difference:238 - 31 =
What will be an ideal response?
207
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Define potable water and describe some of the inherent problems of surface-collected water.
What will be an ideal response?
____________________ is a combination of amplitude and frequency.
Fill in the blank(s) with the appropriate word(s).
What prevents cold air from being circulated to the heated space during the defrost cycle?
A. The auxiliary heater turns on to "temper" the air. B. All of the dampers close automatically. C. The indoor fan motor turns off. D. Both a and b are correct.
In United States airspace, the average number of commercial aircraft in the sky on an average morning is 4000. There are another 16,000 planes on the ground. Aerospace company Rockwell-Collins developed what it calls a “digital parachute,” a panic-button technology that will land any plane in a pinch at the closest airport, no matter what the weather or geography, and without the help of a pilot. The technology could be applied where a pilot is no longer capable of flying the plane, or is panicked and confused about what to do in an emergency. Assume the cost of retrofitting 20,000 commercial airplanes is $55,000 each and the plane stays in service for 15 years. The technology could save an estimated average of 40 lives per year; the value of a human life is estimated at
$4,000,000. Use an interest rate of 8% per year to determine the B/C ratio. What will be an ideal response?