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[tex][\frac{45.82g}{3.0cm^{3} } - \frac{0.64g}{0.859cm^{3} } ] [/tex]÷ 2

 Please help I keep getting 7.26, but the answer is 3.0g/cm^3 What am I doing wrong?
:<

Respuesta :

wolf1728
(45.82g / 3 cc - .64g / .859) / 2

(15.2733333333  - 0.7450523865) / 2

14.5282809468 / 2

and I get
7.2641404734

I'd say make sure all those numbers you posted (45.82; 3.0, etc) are correct.
Also, going by the units you have listed, the answer CAN'T be in 1/cm^3 units because the units should cancel and you'd have a dimensionless number.

apologiabiology
multiply left fraction by (0.859)/(0.859) and right one by (3/3)

[tex] \frac{ \frac{(0.859)(45.82g)}{(0.859)(3cm^3)} - \frac{(3)(0.64g)}{(3)(0.859cm^3)} }{2} [/tex]=
[tex]\frac{ \frac{(0.859)(45.82g)-(3)(0.64g)}{(0.859)(3cm^3)} }{2} [/tex]=
[tex]( \frac{(0.859)(45.82g)-(3)(0.64g)}{(0.859)(3cm^3)})( \frac{1}{2}) [/tex]=
[tex]( \frac{(0.859)(45.82g)-(3)(0.64g)}{(2)(0.859)(3cm^3)}) [/tex]=
use calculator
[tex]7.26414\frac{g}{cm^3} [/tex]

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