Answer:
Your answer would be 26°.
Explanation:
By knowing that a slope of 1 would give a slope of 45°. This is because each time you move one right, you'll go up 1. By knowing this, the answer is rather simple to solve.
So just do:
45 * 10/17 ---> about 26.4705882353°
Then round it...
26.4705882353° ---> 26°
Your answer is to a horizontal slope, which is at 0°, so your answer would be 26°.