John had a puppy that weighed 12 pounds. Over a year, the puppy gained a significant amount of weight and is now 35 pounds. Use the variable x to represent the amount of weight the puppy gained.

x=35-12

Step-by-step explanation:x equals 23

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)