Expression 3: 420 positive "f" prime left parenthesis, 120 , right parenthesis left parenthesis, "x" minus 120 , right parenthesis left brace, 120 less than or equal to "x" less than 250 , right brace420+f′120x−120120≤x<250
3
Expression 4: left parenthesis, 120 plus 113 "t" , 0 , right parenthesis120+113t,0
00
domain t Minimum:
less than or equal to "t" less than or equal to≤t≤