Leanne leaves town traveling at an average speed of 50 mph. after 4 hours, bart leaves town traveling in the same direction at an average speed of 67 mph. which of the following equations could be used to represent the distance between leanne and bart after x hours?

y = 17x
b.
y = 200 + 17x
c.
y = 200 - 67x
d.
y = 200 - 17x

The surface area for this case is given by:
 A = 2 * pi * r ^ 2 + 2 * pi * r * h
 Where,
 r: radius of the coins
 h: height of the coin stack.
 Substituting values we have:
 A = 2 * 3.14 * (1/2) ^ 2 + 2 * 3.14 * (1/2) * (100 * (1/8))
 A = 40.82 in ^ 2
 Note: the correct thickness of the coins should be 1/8 in.
 
 Jose will need 40.82 in ^ 2 to cover the stack of coins