A crew is digging a man-made lake. They started in the morning and then had lunch. After the lunch break, the crew dug down another 1.8 feet before heading home. Before they left, the boss said, "If you dig the amount you dug today every day, then it will take you 3.5 days to finish." The bottom of
the lake will have an elevation of —27.3 feet
.
What was the lake's elevation before the lunch break? We don't know, so let's call it b for break elevation.
Which expression represents the elevation of the lake at the end of the first day?
ob- 1.8
o 1.8 - 6
0
Ob + 1.8

In may you used 400 kilowatt-hours of energy for electricity. a. calculate the total electrical energy use in joules. b. calculate your average power use in watts. c. assume that your power supplier generates electricity by burning oil. note that 1 liter of oil releases 12 million joules of energy. how much oil is needed to generate the electricity you use? give your answer in both liters and gallons. a. the total electrical energy use was nothing _ joules. (type an integer or a decimal.) b. the average power use is nothing _ watts. (round to the nearest whole number as needed.) c. to generate the electricity you used, nothing _ l is needed. (round to the nearest whole number as needed.) to generate the electricity you used, nothing _ gal is needed. (round to two decimal places as needed.)