Problem $3-8($Algo$)$

Air travel on Mountain Airlines for the past $18$ weeks was:

$\backslash$table$[[$Week$,$Passengers$],[1,232],[2,234],[3,245],[4,250],[5,254],[6,252],[7,258],[8,263],[9,271],[10,270],[11,278],[12,281],[13,281],[14,288],[15,290],[16,303],[17,305],[18,310]]$

Use regression to develop a forecast for the expected number of passengers for the next three weeks. $($Round your answers to two decimal points.$)$

$\backslash$table$[[,],[$Week $19,],[$Week $20,],[$Week $21,]]$