Convert into decimals and subtract 3L 42ml from 7L 36ml

Subtract - 7 from (-4)/7

-2 subtracted from 7 gives

2 subtracted from 7 gives-

Subtract 63 from (-100 + 7 )

Convert fraction into decimal fraction: 7/100

Subtract (-12)/7 from 15/4

If we subtract 3/5 from 7/20 we get ____

6 what is the change in internal energy when a gas contracts from 377 ml to 177 ml under a constant pressure of 1520 torr, while at the same time being cooled by removing 124 J heat? [Take (1 L atm)= 100J]