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TiliK225 [7]
3 years ago
14

Christopher is going to install wallpaper on the four walls of his room. Two of the walls are 14 feet long by 9 feet high. The o

ther two walls are 20 feet long by 9 feet high. His options at the wallpaper store are below. One single roll of wallpaper costs $20 and covers 18 square feet of area. One double roll of wallpaper costs $40 and covers 54 square feet of area. What is the minimum cost of installing the wallpaper on the four walls of Christopher's room?
Mathematics
2 answers:
alexandr1967 [171]3 years ago
5 0

Answer:

idk

Step-by-step explanation:

Aliun [14]3 years ago
4 0
Given:
2 walls - 14ft by 9ft
2 walls - 20ft by 9ft

Wall 1 & 2 = 14ft * 9ft = 126 ft² x 2 = 252 ft²
Wall 3 & 4 = 20ft * 9ft = 180 ft² x 2 = 360 ft²

Total area = 252 ft² + 360 ft² = 612 ft²

Cost of 1 single roll: $20
612 ft² ÷ 18 ft² = 34 rolls * $20 = $680

Cost of double roll: $40
612 ft² ÷ 54 ft² = 11.33 rolls ⇒ 12 double rolls
12 * $40 = $480

If Christopher opts for 1 single roll of wallpaper, he'll spend $680.
If he opts for double roll of wallpaper, he'll spend $480.

Double roll of wallpaper is the cheaper option. He'll save $200 if he'll buy the double roll of wallpaper.
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Answer:

x = 2root(22)

see image.

Step-by-step explanation:

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see image.

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the best measurement to report with the scale in my opinion would be tens of pounds. my reasoning is because the decimal place would still prove importance with numbers under one hundred. above one hundred pounds and the decimal place becomes kind of pointless. 

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