#### 6, 7
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- Divide by 2: \( n^2 + n - 42 = 0 \).
- Factor: \( (n + 7)(n - 6) = 0 \) → \( n = -7 \) or \( n = 6 \).
- Integers are 6 and 7 (considering positive integers).
- A ladder leans against a wall, forming a 75-degree angle with the ground. If the ladder is 20 feet long, how high up the wall does it reach?
- Use the sine function: height = 20 × sin(75°).
- Calculate: \( \sin(75°) \approx 0.9659 \).
