Astrophysics question

1. A star in the main series. Explain how the radiated power, surface temperature, lifetime and location in the HR diagram depends on the star’s mass.

2.E = 1/4Pi*r^2 (I think, need help with this)

3.I know that the lifetime of the star depends on its mass because of the fusion process, or how fast the atoms in the star fuses (which is connected to the stars temperature). I know that radiation power is L which is how much energi per time it releases. This is found by using

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