Answer: cross-sectional study
Step-by-step explanation:
- A cross-sectional study is a kind of research study in which a researcher collects the data from many different persons at a single point in time.
- In this study researcher observes the variables without influencing them.
Here, A research company uses a device to record the viewing habits of about 2500 households (that includes different persons such as adults , children and seniors )
The data collected today(at a single point in time).
If it is used to determine the proportion of households tuned to a particular children's children's program.
The type of observational study is described in the problem statement : "cross-sectional"
Answer:
90
Step-by-step explanation:
i did the math hope this helps you out
2x+7x= 180
9x=180
x=20
Plug the x value in to both expressions
2(20)=40
7(20)=140
Final answer: 40 degrees, 140 degrees
