9 and 16 have no common factors, therefore the GCF is 1.
50-500 USD depending on specifics
A Desert Eagle .50 AE will fire them.
1,2,5,10
1,2,3,6,9,18
Which .50 cal, and do you mean .357 Magnum? If you're comparing the .50 AE to the .357 Magnum, the .50 AE is more powerful, by far.
1 and 97
No. It could be done, if an upper receiver and barrel were made for it. However, to the best of my knowledge, no .50 AE uppers exist.
They are: 2 and 7
1, 5, 7, 35
1, 2, 31, 62
48 has only 2 prime factors, not 8!