Answer:
See below.
Step-by-step explanation:
1)
So we have:

This can be interpreted as:
"There exists a natural number <em>x</em> and an integer <em>y</em> such that x² is equal to y²."
2)
So we want even numbers are in the set of integers.

This is interpreted as:
"The set of even numbers (2n such that n is an integer) is in the set of integers"
Answer: 
Step-by-step explanation:
- The formula for the distance between points:
- Coordinates of point A (0;5 ); coordinates of point B(4;0)

Answer:
D I'm not sure if it is correct but I'm sorry if wrong Good luck!
Answer:
This is not a proportion
Step-by-step explanation:
Set up a proportion
9/6 = 2/1
Check with cross products
9*1 = 6*2
9 = 12
This is not true so they are not proportional
Answer:
I believe it should be A
Step-by-step explanation: