So i was wondering is anyone here good at assembly langauge (like sim88)?

Here are three codes i need:

*subtract 4 from 18 and store result in 00f0*

subtract 8 and 7 and store result in 00f2

subtract 8 and 7 and store result in 00f2

and there is a last one using using a loop which

*multiplies 4 by 4 and stores the result in 00f8.*