Yesterday, the tempature at noon was 11.4. by midnight, the temperature had decreased by 15.7 degrees. the temperature then decreased 1.2 decrease each hour from midnight to 2am. what was the temperature at 2 am

the temp at 2 am is -6.7 degrees

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)