In these kind of problems, it's always the best to just draw it. There are "formulas" to calculate this, but it's better to know intuitively.
Midpoint, as the name suggests is the point that is exactly halfway between two points. To find a midpoint in one dimension, we would take an average between those two points.
Example: Number exactly halfway between 8 and 16 is

We can do the same for two dimensions, it just means we'll have to calculate both for x-values and y-values
Midpoint
Answer:
For A, 3/7 greater than a whole
For B, 1/5 greater than a whole
For C, 1/3 greater than a whole
Step-by-step explanation:
Subtract the number on the left from the number on the right. then put what you get over the number on the right
Answer:
B
Step-by-step explanation:
Rise over run
Answer:
(x+2) ^2 =11
Step-by-step explanation:
x^2+4x=7
To complete the square, take the coefficient of the x term, 4
Then divide by 2, 4/2 =2
Then square it 2^2 =4
Add that to both sides
x^2 +4x+4 = 7+4
The left hand side can be rewritten as (x+b/2) ^2 where b is the coefficient of the x term
(x+2) ^2 =11