Type it as it is written
Type a calculation in the same order as it is written. Here: 4 times the sine of 30, times 30 plus 10 times 3. Type 4, press 
, then 
, and type 30. The sine key opens a parenthesis by itself, so close it with 
. Press , 
, type 30, press 
, type 10, press , type 3, and . Press 
. The calculator works out the right order by itself: the answer is 120.