Question

`[(45.82g)/(3.0cm^(3) ) - (0.64g)/(0.859cm^(3) ) ]`÷ 2

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

Answer 1

(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.

Answer 2

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


`( ((0.859)(45.82g))/((0.859)(3cm^3)) - ((3)(0.64g))/((3)(0.859cm^3)) )/(2)`=

`( ((0.859)(45.82g)-(3)(0.64g))/((0.859)(3cm^3)) )/(2)`=

`( ((0.859)(45.82g)-(3)(0.64g))/((0.859)(3cm^3)))( (1)/(2))`=

`( ((0.859)(45.82g)-(3)(0.64g))/((2)(0.859)(3cm^3)))`=
use calculator

`7.26414(g)/(cm^3)`