Conversions for QR

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Yup..it comes up all the time..I was told to know Mile to Km or vice versa. or Know the Temp stuff really well( F to C or C to F and C to Kelvin). Can someone Post them up the formula for all of them?

PS. you need to know Kg to gram, foot to miles . Cant think of anything else for now.but if I rmr somthing I will post them up.
 
bump. Is there anything else we need to memorize? formulas for surface area, sphere, etc?
 
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