The density of the human body is estimated to be 0.95 g/cm^3
Calculate the volume of a person wighing 79.99kg
Express your answer in the form a x 10^n, where n is and element of N and 1 <a<10
Density is defined by: $\displaystyle density = \dfrac{mass}{volume}$ thus $\displaystyle volume = \dfrac{mass}{density}$ .
With your example you have:
$\displaystyle V=\dfrac{79.99\ kg}{0.95\ \frac{g}{cm^3}}$
You have to convert the mass unit into g:
$\displaystyle V=\dfrac{79990\ g}{0.95\ \frac{g}{cm^3}}=84200\ cm^3$
And now change the notation of this result as required.