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thomasbarbusca15
20.10.2019 •
Mathematics
Arectangular driveway has an area of 880 square feet and a perimeter of 128 feet. what are the dimensions of the driveway?
10 !
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Ответ:
Dimensions are 20 X 44 feet
Step-by-step explanation:
First we need to build two equations:
For area X times Y = 880
For Perimeter 2x + 2y = 128
Now we need to solve one so we can substitute it into the other:
2x + 2y = 128 becomes
2x = 128 - 2y and then
x = 64 - y We will substitute this into the are equation
(64 - y)y = 880
64y -
= 880
-![y^{2} + 64y -880 = 0](/tpl/images/0337/4399/37a53.png)
factor out the negative
-(![y^{2} - 64y +880 = 0](/tpl/images/0337/4399/b86ca.png)
Factor:
-(y - 20)(y - 44) = 0
y-20 = 0 and y - 44 = 0
y = 20 and y = 44
Plugging these in two both of our formulas works
20 X 44 = 880 for area
2(20) + 2 (44) = 128 for perimeter
Ответ:
i think its c
Step-by-step explanation: