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Solution |
1) On April 2, 2013 Mrs Green planted two bushes of the same variety three feet apart, stem to stem. They both have a diameter of 1 foot. The diameter of this kind of bush grows at a rate of 4 inches per year. Assume the growth rate is constant and she doesn't trim the bushes. In what year
will the two bushes touch and begin to form a hedge?
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- If the bushes are planted 3 feet (36 inches) apart and they both have a diameter of 1 foot, then they are separated by ____ inches.
- That separation decreases at the rate of of ___ inches per year.
- It takes ___ years to close the distance between the bushes.
- That year is ______
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2) Sarah, Will and Jeff are replacing the fencing at
the petting zoo where they work. They need
enough fencing to go around the animal pen which
is 90 ft by 45 ft. They also need fencing to go
around the walkway on the outside of the pen. The
walkway is 3 feet wide. If the fencing comes in 12
foot sections, how many sections of fencing will
they need to buy to replace all the fencing?
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- Inner fence length = _____ ft.
- Outer fence length: add ___ feet to each dimension to accommodate the walkway: ____ ft.
- Total fencing = _____ ft.
- Total sections = ______ sections
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3) Mr. O'Malley leaves his laptop in Sleep-mode about 10 hours every day when he could actually
turn it off according to his son. It uses 1.6 watts per hour of power in Sleep-mode. Electricity
costs $0.105 per kilowatt per hour where he lives. A kilowatt is 1000 watts. How much could he
save per year if he were to shut his lap top down completely instead of using Sleep mode?
Assume there are 365 days in a year. Round to the nearest cent.
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Sleep mode cost: Multiply the (1) number of hours per day, _____ (2) the number of wats per hour used, _____, (3) the number of days in a year, _____, (4) the cost per kilowatt hour of electricity, _____, and (5) divide by the number of watts in a kilowatt, ______
Total cost = _____ cents
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