nanamath5662
05.10.2020 •
Mathematics
A rectangular piece of cardboard has a width of x and a length of y. When 15
centimeters is trimmed from the width and 25 centimeters is trimmed from the length,
which expressions describe the remaining piece of cardboard?
Classify each expression below according to whether it represents the perimeter, area, or
neither of these
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Ответ:
Step-by-step explanation:
Initial length of the cardboard was y cm, and width was x cm.
The new dimensions are:
length = (y - 25) cm
width = (x - 15) cm
Area of the new rectangle = length x width
= (y - 25) x (x - 15)
= (y - 25) (x - 15)
Perimeter = 2 ( length + width)
= 2 ((y - 25) + (x - 15))
= 2(y - 25) + 2(x - 15)
Therefore:
2(x + y) - 40 is neither of these
2(x - 15) + 2(y - 25) is the perimeter
(x - 15)(y - 25) is the area
(x - 25)(y - 15) is neither of these
2(x - 15)(y - 25) is neither of these
2x + 2y - 80 is the perimeter
xy - 375 is neither of these
x + y - 40 is neither of these
Ответ:
Hope this helped :)