​write the algebraic expressions for  : 
 1. EIGHT SUBTRACTED FROM FOUR TIMES A NUMBER MULTIPLIED BY THREE

The algebraic expression for this is : 8 - 4x * (3)
(where number = x)

4x * 3 -8

3(4x - 8)

let the no. be x 
therefore:-
it's four times so it would be = 4x
8 is subtracted from this no. so = 8-4x
and this whole equation is multiplied by 3 so we get = 3(8-4x)
​so the final equation is 3(8-4x).
hope it will help you a lot!