<span>3 times the sum of b and f can also be written as </span>

where x is the estimated value and xr the real value

the percent error is 10.71%
Answer:
I don't know
Step-by-step explanation:
I can't see the image for the problem or I don't ser any questions
The midpoint of these two points would be (2, 8)
To find the midpoint of any two points, simply take the average of the x's and then the average of the y's. This will create a point directly in between them. To take an average, add the points together and then divide by 2. We'll start with the x values.
X VLAUE
11 + - 7 = 4
4/2 = 2
Next we do the same for the y value.
Y VALUE
3 + 13 = 16
16/2 = 8
Now we can take these two answers and put them together for the ordered pair of (2, 8)