Alan

Total to be payed = $1250*1.08 = $1350

11 monthly payments at $120/month = $1320 leaving just $30 for the last payment.

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I assume you mean the area of a circle!  This is given by pi*r² where r is the radius.

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It could just be that heureka is a member of the Flat-Earth Society like Chris and myself!

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Of course not - that would be ridiculous!

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I get the same as Chris:

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You need to register to upload images

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I think you might find that it takes light ∼100,000 years to cross the Milky Way!

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When it enters at right-angles to the surface.  The sine of the angle of refraction is proportional to the sine of the angle of incidence, so if the angle of incidence is zero, so too is the angle of refraction.

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Hexadecimal numbers use base 16 instead of our normal decimal numbers that use base 10.  The "units" go from 0 to 15 instead of 0 to 10.  The numbers beyond 9 are represented by the letters A to F.  That is 10 is represented by A, 11 by B, 12 by C, 13 by D, 14 by E and 15 by F.

The next highest "places" after the "units" represent multiples of 16.  So, for example the hexadecimal number

 2AF4  is 2*16^3 + 10*16^2 + 15*16 + 4 = 10996 (in decimal).  

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