## To find the number of degrees to the right of the line from the tee to the hole that the drive was sliced, we need to calculate the angle formed by the tee, the ball's landing spot, and the hole.

First, let's find the distance between the tee and the ball's landing spot. Since the golfer sliced his drive to the right, we need to subtract the distance the ball traveled from the total distance of the hole:

Total distance of the par 4 hole = 390 yards

Distance the ball traveled = 280 yards

Distance between the tee and the ball's landing spot = Total distance - Distance traveled

= 390 yards - 280 yards

= 110 yards

Next, we need to calculate the distance between the tee and the hole. Since it is a straight par 4, we can assume the golfer hit the ball directly towards the hole (ignoring the slice):

Distance between the tee and the hole = 390 yards

Now, we can use the trigonometric function "tan" to calculate the angle to the right of the line from the tee to the hole:

tan(angle) = opposite/adjacent

In this case, the opposite side is the distance between the tee and the ball's landing spot (110 yards), and the adjacent side is the distance between the tee and the hole (390 yards).

angle = tan^(-1)(opposite/adjacent)

= tan^(-1)(110/390)

Calculating this using a calculator, we find that:

angle ≈ 16.8 degrees

Therefore, the golfer sliced his drive approximately 16.8 degrees to the right of the line from the tee to the hole.