Coding and Decoding Questions

In a certain code language, "HISTORY" is written as "XQNSRHI". How is "ETHICS" written in that code language?

If 18∆4 = 11, 16∆8 = 12 and 6∆12 = 9, then find the value of 18∆14 = ?

In a certain code language, "BIOLOGY" is written as "YRLOLTB". How is "PHYSICS" written in that code language?

If E=5, PEN=35, then PAGE=?

In a certain code language, "SELDOM" is written as "NPEMFT". Howis "SACRIFICE" written in that code language?

In a certain code language, "ACCOUNT" is written as "DFFRXQW". How is "MATHS" written in that code language?

If 3 # 6 * 9 = 45 and 9 # 8 * 7 = 105, then what is the value of 5 * 6 # 3 = ?

In a certain code language, "SPICEY" is written as "ELOUAY" and "PONDER" is written as "JKLNAZ". How is "HOUSED" written in that code language?