It might be possible that the laptop did not come loaded with correct video/display software or drivers. By installing appropriate software or drivers, you should be able to get the 1440x900 pixels resolution. Please check with the place you purchased your laptop to see which software or driver available. I am sure you can purchase software and drivers online also.
The measurements used to determine a monitors screen resolution is Pixels per Inch (PPI). The size of a monitor in inches and the total pixels in the horizontal and vertical directions determines the PPI of the screens resolution. For Example a 15 inch monitor has a maximum of 1024x768 pixel resolution.
divide size in pixels with size in inches for width or height of photo and you will get resolution
It probably refers to the resolution of a screen. That would be low resolution.
I think what you mean is to change the resolution of the PDF files? 'Cause I found this : "e.g. a 300 dpi printer has "pixels" that are 1/300 inches in size, while a 72dpi monitor has 1/72 inch sized pixels. A 100x100@72dpi image on a monitor would have to be printed out at about 417x417 printer pixels to have the same apparent size (300/72 = 4.16666)" So if it does, here is the solution: In Adobe Acrobat, "Edit > Preferences > Convert to PDF", choose the file you want to change, select "Adobe PDF Settings > Editing > Standard" and then Edit again to change the resolution. May this will do some help.
Most of them are .039-.043 inches.
Change = -6 inches so %age change = -6/12*100 = -50%
The largest display screen size available for the IBM ThinkPad T42 laptop is a 15 inches (1024x768). This laptop can also be purchased in a smaller size.
Inlet valves 0.010 inches (0.25mm) Exhaust valves 0.008 inches (0.20mm)
Divide inches by 39,370.1
468 inches
The diagonal screen size is 8.9 inches. The max resolution is 1,024 x 600.
It would be 68 inches.