Mathematics, 30.08.2019 16:00 annieleblanc2004

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 other 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?
$

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2 of the walls are 14 ft by 9 ft
A = L * W
A = 14 * 9 = 126 sq ftand since there is 2 of them...2(126) = 252 sq ft

2 of the walls are 20 ft by 9 ft
A = L * W
A = 20 * 9
A = 180 sq ftand since there are 2 of them ..2(180) = 360 sq ft

so for all 4 walls, we have : 252 + 360 = 612 sq ft

54 * 11 = 594 sq ft...so we need 11 double rolls...which costs 11(40) = $ 440
18 * 1 = 18 sq ft and we need 1 single roll...which costs $ 20

so we have 612 sq ft to cover11 double rolls cover 594 sq ft and cost 440...and 1 single roll which covers 18 sq ft and cost 20
for a total cost of : $ 460 <==

Answer from: Quest

the results from a pre-test for students for the year 2000 and the year 2010 are illustrated in the box plot. what do these results tell us about how students performed on the 29 question pre-test for the two years?

if we compare only the lowest and highest scores between the two years, we might conclude that the students in 2010 did better than the students in 2010. this conclusion seems to follow since the lowest score of 8 in 2010 is greater in value than the lowest score of 6 in 2000. also, the highest score of 28 in 2010 is greater in value than the highest score of 27 in 2000.

but the box portion of the illustration gives us more detailed information. the middle bar in each box shows us that the median score of 20 in 2000 is greater in value than the median score of 17 in 2010. further, we note that the box and whiskers divide the illustration into four pieces. each of these four pieces represents the same portion of students. so, the upper half of the students in 2000 scored in the same score range as the upper one-fourth of the students in 2010, see the illustration at a score of 20.

by considering the upper one-fourth, upper half, and upper three-fourths instead of just the lowest and highest scores, we would conclude that the students as a whole did much better in 2000 than in 2010. we would conclude that as a whole the students in 2010 are less prepared than the students in 2000.

in this section, we discuss box-and-whisker plots and the five key values used in constructing a box-and-whisker plot. the key values are called a five-number summary, which consists of the minimum, first quartile, median, third quartile, and maximum.

step-by-step explanation:

Answer from: Quest

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step-by-step explanation:

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