The angle the golfer went off line from the tee when they drove the ball
is
because the cosine rule has been applied to calculate the angle
From the question we are told that:
Distance of hole from tee 
Distance to the right 
Ball distance from hole 
Given that the three points form a triangle x,y,z respectively
Where



Using Cosine Rule

Therefore




In conclusion the angle the golfer went off line from the tee when they
drove the ball is mathematically deducted and give as

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The amount spent on each tube is $18.5
The total amount spent to rent 15 tubes by the group is $277.50.
Since they did not specify in the question the types of tubes they rented, we cannot determine each types of tubes that the group rented but we can determine the amount spent on each tube provided that they are all the same types.
∴
if 15 tubes = $277.50
1 tube = $x
By cross multiplying:


Therefore, we can conclude that the amount spent on each tube is $18.5
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