A barrel of oil produces about six million btu's. A ten minute shower uses six thousand btu's. One barrel of oil will provide the energy needed for how many showers? Now assume each American takes one shower a day. Divide the above answer into the number of Americans to get the number of barrels used each day in the United States for showers

Solve 2x+y=3 x+y=5 in substitution method

Which graph has a rate of change of zero

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point