kyleee1991
19.11.2020 •
Mathematics
The cost of 9 scares is $78.75 what is the unit price ?
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Ответ:
A = 150
L = 2W - 5
150 = W(2W - 5)
150 = 2W^2 - 5W
2W^2 - 5W -150 = 0
(2W + 15)(W - 10) = 0
2W + 15 = 0
2W = -15
W = -7.5 <== not this one
W - 10 = 0
W = 10 <===the width is 10
length is 2W - 52(10) - 520 - 515