53
4 + 9 = 13, the one carries over, so 3 + 1 + 1 = 5
15 km = 5 trips
3km = 1 trip
24 km = 8 trips
Y=1/2x-2
Since y is 2 less than half of x, you subtract to from 1/2x to equal y.
Answer:
1. 1. Because convenient sampling is adopted here data is only gotten from students that eat in the hall in a given period of time so this is a source of bias
Also one study center that is the Hall of only one school is used this is also biased and may affect the result of the study
To avoid this bias a simple random sampling where each student have an equal chance of being selected in the study should be adopted
