Question 176113
Graph the data using distance east as x axis (start at 0 and go to 75 at least) and temperature as the y axis. 
Then see if you can fit a straight line through the data. 
If so, then it is a good linear model. 
Look at your straight line and read off the value at x=75. That will be the expected temperature at 75 miles east. 
Please post another question if you get stuck. 
I'll start you off here plotting (0,85.2)
{{{drawing( 300, 300, -10, 90, -10, 100,grid( 1 ),circle( 0, 85.2, 2 ),circle( 0, 85.2, 1.8 ),circle( 0, 85.2, 1.6 ),circle( 0, 85.2, 1.4 ),graph( 300, 300, -10, 90, -10, 100, 0)) }}}