Vertical line is a way to determine whether a functin is a function or not.
Answer:

Step-by-step explanation:

Answer:
1. $60
2. 600 Calories were burned
3. D
Step-by-step explanation:
1. $75 x .20=$15
75-15=$60
2. What I started with is 200/40=5 calories burned per min
60 plus 60=120
5x120=600
3. It's the only option that has something decreasing. and there is a -5 which means it's getting subtracted or its decreasing.
63 I think, you would subtract
Answer:
A function of f is continuous on its domain if it is Dirichlet function