Question 1113447
What is this?

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 c= 17(2) + 19(2)
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If you mean this, then write the exponents as they should be:
c=17^2+19^2
{{{c=17^2+19^2}}}


You already know how to add two plain numbers:
{{{289+361=650}}}



The 25.5 does not come from anything - or maybe from a different problem exercise.