- Find percent notation for 6.3?

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Please Help me how you get step by step to find this answer. I am having hard time seeing the answer for Zscore? A tone is composed of modes with frequencies 200, 300, and 400 Hz. What is the period of the wave pattern? Factor completely: 36x^4 - 72x^2 + 36
1. (2x-2)
2. (3x+3)
3. (x+1)
4. (4x-1)? Hey guys, I need help with this math problem. Anyone want to help? Solve for n. answer is given. just need steps?