- How to find differential of dy? y=-x^2 - 4 . Show steps if you can?

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Please help me with this math!!? How come there's no recoil when you throw a ball? A certain substance strongly absorbs infrared light having a wavelenght of 6.50 m what is the frequency in hertz of this light? Calculate the energy in joules of a photon of green light having a wavelenght of 550 nm? Calculate the energy in joules of a photon of red light that has a frequency of 4.0x10^14 hz?