You can write 4 squared by writing a 2 in superscript after the number 4. (42) If you can't use superscript because you're using a computer program that does not allow it writing 4^2 would be an acceptable substitute.
In Microsoft Word you can activate superscript by pressing Ctrl+Shift+Equals
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3/4^2
It is: 4 squared = 16 or 2 to the power of 4 = 16
7(squared) or 7(sq)
4(f2 - g) + (f2 + 2g) which can be expanded and simplified to 5f2 - 2g
Assuming the thing is as written and there are no brackets missed out then it is just 4 squared times 3 = 16x3=48.