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umka21 [38]
3 years ago
6

25+ Points for BEST TWO answers!

Mathematics
1 answer:
lana66690 [7]3 years ago
5 0
 <span>You are not supposed to be wallpapering the ceiling or the floor. Because of that the formula to answering this question is:  2(h*w) + 2(l*w) [to account for the 4 walls being wallpapered] 
2(9 x 18) + 2(9 x 20) 
2(162) + 2(180) 
324 + 360 
684 is the answer 
</span>
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The slope-intercept form:

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