Hi there,
please see below for solution steps :
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First let us revise the rounding rules before getting down to the process of rounding :
[tex]\sf{763.9 \ to \ the \ nearest \ whole \ number :}\\\hfill\stackrel{\small\text{add 1 }}{3^{+1}}.\\\hfill\stackrel{\small\text{drop it}}{9}}[/tex]
[tex]\sf{763.9\approx764}[/tex]
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