Mason wants to use a sheet of fiberboard 21 inches long to create a skateboard ramp with a height of inches at its highest end. Find the angle of elevation made by the ramp with the ground. Round your answer to the nearest tenth of a degree.

It appears that the problem statement is missing the height of the ramp. To determine the angle of elevation, we need both the length of the ramp (which you've provided as 21 inches) and the height at its highest end. **Formula to Use:** The angle of elevation (\(\theta\)) can be found using the sine function in a right triangle: \[ \sin(\theta) = \frac{\text{Opposite}}{\text{Hypotenuse}} = \frac{\text{Height}}{21} \] Once you have the height, you can rearrange the formula to solve for \(\theta\): \[ \theta = \sin^{-1}\left(\frac{\text{Height}}{21}\right) \] **Steps:** 1. **Provide the Height:** Please supply the height of the ramp in inches. 2. **Apply the Formula:** Use the height in the sine formula to find the angle of elevation. 3. **Calculate:** Use a calculator to compute the inverse sine and round the result to the nearest tenth of a degree. **Example:** If, for instance, the height of the ramp is **12 inches**, the calculation would be: \[ \theta = \sin^{-1}\left(\frac{12}{21}\right) \approx \sin^{-1}(0.5714) \approx 34.9^\circ \] Please provide the missing height value so I can help you determine the exact angle of elevation.