Error 9 on the 535 version of the aviva meter will indicate a fresh battery is requird. If you put a new battery into the unit and it displays E-9 again, take the battery out, press any button (arrow or power) and then insert battery again and give it a try. If the same issue is occurring please let accu-chek customer care know so they can replace the unit at no cost.
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The numbers are a red herring suggesting a mathematical answer to a grammatical error. The apostrophe is missing in its.
(15/sqroot(9))=5 So it is 5
Deductive reasoning, trial and error. The square root of 78 will be between 8 and 9, closer to 9. 8.7 squared = 75.7 8.8 squared = 77.4 8.9 squared = 79.2 8.8 is the closest without going over.
There is a faster way Proven with EL-531TH Error 1: Not proper input Press any symbol that requires a number input after it (e.g. + - x ^) and press enter Error 2: Undefinable Ban be done by dividing anything by 0, but it is much faster to just press Log or In and then equals (requires you to reset your calculator before the run) Error 3: Press cos 25 times. May be a faster way. Error 4: Max input reached Rapidly press one key repeatedly until you reach the end of the row (indicated by a flashing triangle). Using a longer input such as cos does not decrease the number of presses required. It is exactly 143 characters to the end of the row. Then press enter. Happy Speedrunning :)