In a survey, 600 people were asked whether they live in a city. If 120 people said they live in a city, what percent of people surveyed live in a city?

20 %

Step-by-step explanation:

20% of people live in a city

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)