ASAP can't seem to figure out where I went wrong (1 Viewer)

[vivekjain0908]

Have a test on Friday so wud appreciate it
I've attached both my working and the answers

 

[vivekjain0908]

accidentally put this under phys, but its 4u

 

[Akshara Patil]

@vivekjain0908 I think it should be clarified now lol