C(cost)=6x+9
9 is the cost of three hot dogs
6x represents 6 tickets and their cost
ANSWER
The substitution property of equality.
EXPLANATION
We know that:

and that

Since x=5 or 5=x , we can substitute x for 5 wherever we see x in the given equation.
When we do that, we obtain;

This is what we refer to as the substitution property of equality.
Answer:
80°
Step-by-step explanation:
Just multiply 40° by 2 to get the arc
Answer:
3
Step-by-step explanation: