A summary of total charges from a small cafs natural gas bills is provided below:

Month	kJ	Cost
October	17	$186
November	16	187
December	28	235
January	36	265
February	32	280
March	17	207

Using regression analysis, the expected cost at 40 kJ would be?

a.

$90

b.

$294

c.

$172

d.

$232