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Answer:
Savings of Jeff will be $140.
Step-by-step explanation:
List price of TV = $700
Now, it is given that, this TV is available at 20% off or 20% discount during the President's week.
So, rate of discount = 20%
Now, discount = 20% of $700

= $140
Now, the discount of $140 is the amount of money that Jeff saves if he buys the TV on President's Day.
Answer:
An observational study
Explanation:
observational studies are those a study where the researcher observes the effect of a defy factor, diagnostic test, treatment or other intervention without trying to change who is or isn't exposed to it. Cohort study and control studies are of two observational studies. These are the part of fundamental of epidemiological research. These are called observational studies because the investigators observe individuals without manipulation and intervention. These studies are an important category of study design. Well, design observational studies maybe the next best method to address these types of questions.
8 is 3+5, that would be the correct answer
The coefficients of x and y in the first equation are 3 and -4, respectively.
The coefficients of x and y in the second equation are 1 and 6, respectively.
The coefficient matrix lists these coefficients in order on successive rows, so it will be ...
![\left[\begin{array}{cc}3&-4\\1&6\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D3%26-4%5C%5C1%266%5Cend%7Barray%7D%5Cright%5D)