What Does the Dot with Waves Icon Mean on My HP 50g?

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DieCommie
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Hello,

I have the HP 50g and I like it. Recently an icon has been light up on top and I don't know what it means. Its a dot with 2 waves on each side. It almost looks like an icon for some sort of IR emission.

Its in between the alpha and the hourglass. I haven't noticed it on before recently. What does it mean?
 
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I have the HP 50g. I can not get my answer in sq root ie absolute value of vector whose answer is sq root 10 shows the answer as a decimal. I have tried different mode settings with no luck. How can I get the answer displayed as a surd/irrational
thankyou
 
Push and hold down the RSHIFT key (the orange one), then press enter. You should see the tilde (~) turn into an equals mark (=). This will make it so that all of your future entries will be displayed in symbolic form.
 
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