I belive it is the second option!
Answer:
1) Let's consider the first case with the number 0 the oppose is also 0 and we have that 0-0=0 so then applies
2) Now let's consider any real number a no matter positive or negative we will have that:

Or in the other case:

So then we can conclude that the expression is a general rule and is true
Step-by-step explanation:
For this case we can verify if the following expression is true or false:
The sum of x and it’s opposite is always zero?
If we want to proof this we need to show that for any number is true.
1) Let's consider the first case with the number 0 the oppose is also 0 and we have that 0-0=0 so then applies
2) Now let's consider any real number a no matter positive or negative we will have that:

Or in the other case:

So then we can conclude that the expression is a general rule and is true
Answer:
$192
Step-by-step explanation:
2400/48=50
50x3.84=192
Answer:
x = 68º
Step-by-step explanation:
This trapezoid is a quadrilateral. All degrees in a quadrilateral have to add up to 360º.
76º + 135º + 81º + xº = 360º
292º + xº = 360º
xº = 360º - 292º
xº = 68º
Answer: x = 3, y = 3.
Step-by-step explanation:
The decision on a photo