Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

The precision of a laboratory instrument is ± 0.05 g. the accepted value for your measurement is 7.92 g. which measurements are in the accepted range? check all that apply. 7.85 g 7.89 g 7.91 g 7.97 g 7.99 g

Need only answer if you think you know it

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?