The materials handling manager of a manufacturing company is trying to forecast the cost of maintenance for

the company's fleet of over$-$the$-$road tractors. The manager believes that the cost of maintaining the tractors

increases with their age. The following data was collected:

a$.$ Use POM for Windows' least squares$-$linear regression module to develop a relationship to forecast the yearly

maintenance cost based on the age of a tractor. $($Enter your responses rounded to three decimal places and include a

minus sign if necessary.$)$

$Y=+x$

where $Y=$ Yearly maintenance cost in dollars and $x=$ Age in years.

b$.$ If a section has $30$ two$-$year$-$old tractors, what is the forecast for the annual maintenance cost? $ $.($Enter your

response rounded to two decimal places.$)$