Answer:
D. 
Step-by-step explanation:
Consider the set

This set consists of four ordered pairs.
The first numbers in these pairs are
These numbers are integer numbers (not natural, because -3 is negative).
The second numbers in these pairs are
These numbers are integer numbers too (not natural, because -2 is negative).
Options contain only natural and real sets, so, the first and the second numbers are real numbers and

Answer:
hope this an helps
Step-by-step explanation:
55.50 divided by 2 = 27.75
Only ask about the cost of tickets.
Answer:
x=30
y=17
Step-by-step explanation:
We know that 6x+9 = 129 since they are vertical angles
6x+9 = 129
Subtract 9 from each side
6x+9 -9 =129-9
6x = 120
Divide by 6
6x/6 =120/6
x = 20
3y+129 =180 since they make a straight line and straight line are equal to 180 degrees
3y+129 =180
Subtract 129 from each side
3y+129-129=180-129
3y = 51
Divide by 3
3y/3 = 51/3
y = 17