Step 1: Find the slope using 
:
Step 2: Plug the slope and one-point into point-slope form 
:
Let's use (4,1) since there's no negative involved. That makes it easier:
If you mean to translate it to Spanish it is División de, resta, multiplicacion, adición
You need to find the surface area and the volume. The formula for surface area is 4*3.14(pi)*radius^2 which is equal to 6.5144 inches^2 in this case. The amount of rubber needed to fill it is equal to the volume. The formula for volume of a sphere is 4/3*3.14(pi)*radius^3, just plug in the number (remember radius is half of diameter) and that will give you the answer!
Answer:
x = 10 meter
y= 20 meter
shadw of a man = 10 meters
