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Stationary waves, or standing waves, form when two waves of equal wavelength and amplitude travel in opposite directions along the same path. This interference results in a wave pattern that appears to be standing still.
Find the Value of 
20% of (√9216 + ?) = 24
[(15)³ × (8)²] ÷ (90 × 6) = ?²
8 × 25% of ? = 400
25% of 400 + 3 × 102 = ?2
? = 20% of 1200 + 256
