Answer:
|2x|
Step-by-step explanation:
The square root symbol indicates the positive square root. That is, ...

Then the square root you show is ...

Answer:
Percent Error:: 12/36 = 33 1/3 %
Step-by-step explanation:
In a line with negative slope, as x increase, y decreases.
Answer:
Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number. So, for instance, 2728 has alternating sum of digits 2 – 7 + 2 – 8 = -11. Since -11 is divisible by 11, so is 2728.