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Answer:
Part a) The volume of the air is 
Part b) The volume of the plastic is 
Step-by-step explanation:
we know that
The volume of the sphere is equal to

step 1
Find the volume of the complete ball (air +plastic)
we have
------> the radius is half the diameter
substitute


step 2
Find the volume of the air
we have that
The plastic is 2 mm thick
Convert to cm
2 mm=2/10=0.2 cm
so
The radius of the interior of the ball is

substitute

-----> this is the volume of the air (interior of the ball)
step 3
Find the volume of the plastic
we know that
The volume of the plastic is equal to the volume of the complete ball minus the volume of the air
so

Answer:
see the explanation
Step-by-step explanation:
we know that
The equation of a horizontal line is equal to the y-coordinate of the point that passes through it
so
In this problem, the line passes through the points
(-3.5,4),(0,4), and (6.2,4)
The y-coordinate is 4
The equation of the horizontal line is
y=4
therefore
Any point with the y-coordinate equal to 4, fall on this line
Example
(1,4) and (5,4)
You follow the same steps to get the product
Answer:
48 or 47.9
Step-by-step explanation: