I think it would be 15 cents!
Your answer would be x= -42
Answer:
The surface is a cylindrical surface with radius 7 units
Step-by-step explanation:
The equation is properly written as:

The above equation takes the form 
Where 

and 


r = 7 units
The surface is a cylindrical surface with radius 7 units
Answer:
Theoretically, about 208 times, but it doesn't work in practice