A community center is collecting blankets. Last year the center collected 81 blankets. This year they were able to collect 102 blankets. By what percentage did the community center increase the amount of blankets that they collected? Very sorry I can't download any links you give me, sorry.

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Step-by-step explanation:

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)