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Svetlanka [38]
2 years ago
10

Which situation is an example of an observational study?

Mathematics
2 answers:
user100 [1]2 years ago
6 0

Answer:

s

Step-by-step explanation:

CaHeK987 [17]2 years ago
4 0

Answer:

D- Recording the reaction time of participants in a study who were asked to press a button as soon as they see a certain picture on a screen.

Step-by-step explanation:

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Answer:

CD = CB - DB \\ CD = 12 - (x - 9) \\ { \tt{but \: CD = 2x - 9}} : \\ 2x - 9 = 21 - x \\ 3x = 30 \\ x = 10 \\  \\ { \bf{CD = 12 - (10 - 9)}} \\ CD = 11

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Evaluate |-11| + |-7|.<br><br> -18<br> -4<br> 4<br> 18
Marta_Voda [28]

Answer:  D) 18

======================================================

Explanation:

|-11| simplifies to 11

|-7| simplifies to 7

Whatever is inside the absolute value, you just remove the negative and that's the result of that absolute value expression. It represents the distance on a number line. So for instance -11 is 11 units from 0, which is why |-11| = 11.

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3 years ago
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