Answer:
B
When I get questions like this, I just substitute each ordered pair in. In this case, I thought that B didn't seem that it would fit, but I substituted to make sure, and this is what I got:
1-2=9...
...which obviously can't be true, so I knew that B was the correct answer.
Hope I helped! Sorry if I'm wrong. :)
~Mschmindy
The answer is 42... you add 56 and 82 then subtract that sum from 180
So the original lawn has an area
24 × 32 = 768 the new lawn will have area 425
this means the area of the sidewalk will be 768-425=343
now the sidewalk is a certain width of we draw it out and label it x we see the lawn has an area of
![(32 - 2x)(24 - 2x) = 425 \\ 768 - 64x - 48x + 4 {x}^{2} = 425 \\ 4 {x}^{2} - 112x + 343 = 0](https://tex.z-dn.net/?f=%2832%20-%202x%29%2824%20-%202x%29%20%3D%20425%20%5C%5C%20768%20-%2064x%20-%2048x%20%2B%204%20%7Bx%7D%5E%7B2%7D%20%20%3D%20425%20%5C%5C%204%20%7Bx%7D%5E%7B2%7D%20%20-%20112x%20%20%2B%20343%20%3D%200)
use the quadratic formula to solve. then you will know how wide the sidewalk is. I will attach picture