Really need help with this physics question, please read to find out?

squirmle

New member
The question goes like this:
Phobos is one of the moons of Mars. It orbits around Mars at a mean radius of 9.38x10^6m with a period of 2.76x10^4s. From this information, calculate the mass of Mars.
Would really appreciate it if you could guide me through this question step by step, explaining each step.
BTW, the answer is 6.41x10^23kg.
Thanks.
 
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