Find the marginal productivity functions StartFraction partial derivative Upper P Over partial derivative l EndFraction and StartFraction partial derivative Upper P Over partial derivative k EndFraction . Pequals 100 l Superscript 0.79 Baseline k Superscript 0.21 Question content area bottom Part 1 StartFraction partial derivative Upper P Over partial derivative l EndFraction equals79 l Superscript negative 0.21 Baseline k Superscript 0.21 (Use integers or decimals for any numbers in the expression.) Part 2 StartFraction partial derivative Upper P Over partial derivative k EndFraction equalsenter your response here (Use integers or decimals for any numbers in the expression.)