- Bond angle of HNC?

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Refrigeration control device name? Given that a:b=8:5 and b:c=3:4. Find the ratio= a:b:c. Give your answer in simplest form? Solve a = b/15? Why do we have to answer math problems?
Isn't maths problem to solve !!!!!!? I need help
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 5 to n = 1.?