Harold's snowball reached a height of 6 ft. and would have hit the ground 22 ft. away. dinah's snowball reached a height of 7 ft. and would have landed 18 ft. away.

30

Step-by-step explanation:

1. The exterior angle theorem states that the two opposing (in terms of the exterior angle) interior angles of a triangle are congruent to the exterior angle. This means that m∠1 (x) + 90 = 120. Now, we just have to solve for x.

2. (Solving)

Step 1: Subtract 90 from both sides.

Step 2: Check if solution is correct.

Therefore, m∠1 = 30 degrees.