Convert $73\mathrm{.}0$ seconds to weeks. Express your answer in scientific

notation.

Find the mass of an object with a density of $4\mathrm{.}5\frac{g}{c}{m}^3$ and a volume of

$12c{m}^3.$

A student measures the mass of an object as $135\mathrm{.}80g.$ Calculate the

percent error in the measurement if the accepted value for the mass is

$137\mathrm{.}23g.$

$4\mathrm{.}15cm1\mathrm{.}8cm($Round to the correct number of significant figures$)$

$12\mathrm{.}0cm-8\mathrm{.}95cm($Round to the correct number of significant figures$)$

$5\mathrm{.}60{10}^3$ has

significant figures.