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a. b × 2y^7 × b³ × y²=2×b⁴×y^9
b. 3m³ × (mn)⁴= 3m³ × m⁴ × n⁴
=3 ×m^7 × n⁴
c. (tn³)⁴ × 4t³ = t⁴ × n12 ×4t³
=4× t^7 × n^12
d. (2x³) × 3( x² y²)³ × 5y⁴
=(2x³) × 3 (x^6 . y^6) × 5y⁴
=(2)(3)(5) (x^9. y^10)
=30 (x^9 . y^10)