$1.)$ Measure the object below, and record your measurement to the correct number of significant figures. Record:

a$.)$ The uncertainty in your measurement.

b$.)$ Your final answer rounded to the correct number of significant figures.

$2.)$ How many feet are in $75$ miles?

$3.)$ Perform the following operation, and record your final answer to the correct number of significant figures.

$4\mathrm{.}5675\mathrm{.}5=$

$4.)$ Perform the following operation, and record your final answer to the correct number of significant figures.

$34\mathrm{.}1+4\mathrm{.}12435=$