Directions:Use the product rule to simplify the following monomials.
16.) (2x⁵y²)(4xy³) + (x⁴y⁴)(3x²y)
17.) (4a³b⁴)(5ab²) + (a²b⁵)(-2a²b)
18.) 19m⁸n⁸ - (4m⁵n)(3m³n⁷)
19.) (-5cd)(-3c⁴d) - (7c²d²)(2c³)

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