Question: I need help with these 3 problems please, and please provide very clear and detailed explanations as well. They're supposed to be written as differential

I need help with these 3 problems please, and please provide very clear and detailed explanations as well. They're supposed to be written as differential equations with full and detailed descriptions.

differential equations with full and detailed descriptions. dac 1. 5 + 4

dac 1. 5 + 4 dt2 + 9x = 2 cos 3t dt (mechanical vibrations, electrical circuits, seismology)16. The rate of change of the mass A of salt at time t is proportional to the square of the mass of salt present at time t. dy y(2 - 3x) 3. dx x(1 - 3y) (competition between two species, ecology)

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