Math help needed guys!?

Question

1) what is the largest prime number which divides into 91

2) Rearrange F=9/5C+32 to show C=5/9(F-32)

3)If 73 three students have a total mass of 4161 kg what is their average mass?

Help me out guys!

It would be gr8 if you could show me the workings and stuff

Answer 1

1) what is the largest prime number which divides into 91

91 has factors of 1, 7, 13, 91 (by trial and error)

13 is the answer

2) Rearrange F=9/5C+32 to show C=5/9(F-32)

F = (9/5)C+32

F - 32 = (9/5)C

C = (5/9)(F - 32)

3)If 73 three students have a total mass of 4161 kg what is their average mass?

4161/73

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