If a is -2 then the denominator would be 0 which is undefined
Answer: D). This was a cross-sectional cohort study
Step-by-step explanation:
The given situation is an example of cross sectional cohort study because the investigator choose the samples from the population using cross sectional method and use the same sample source for analyzing the independent variables for specific period of time or intervals of time to assess the history of exposures and outcomes.
Here, the lung function is tested at an interval of 7 years compared with the levels of exposure to the coal ash so it is the example of cross sectional cohort study.
Every answer to number 1 is detailed and is highly based on substitution... please kindly follow me.. I'll try my best to provide the next answer before I fall asleep.. and click on the thanks button..
You just have to plug your coordinates into the distance formula.
(1, 6) (8, 1)
(X1, Y1) (X2, Y2)
do the work and you get 8.6
Answer:
one could be 2 2/3
Step-by-step explanation: