what is 4.72 x 10 ex power -6 and how do you calculate this on a calculator?
4.72 x 10 ex power -6
enter it like this
4.72 * 10 ^ -6
$${\mathtt{4.72}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{-{\mathtt{6}}} = {\mathtt{0.000\: \!004\: \!72}}$$