For 2 divide, then do the subtraction and multiplication.. 6 / 2 = 3 1-2+15=16 for 3, multiply inside of the parenthesis.. 8x2=16 and subtract 3. 16-3=13..
Let's say that x is the number of days he tweets. Now, if he tweets any number of days, we can represent all of that with just x. So out expression will look like: