Use the commutative and associative properties to simplify the following:

$50\times 17\times 2$

Give the results without actually performing the operations using the given information.

$28\times 19=532$ then $19\times 28=$

Give the results without actually performing the operations using the given information.

$1\times 47=47$ then $47\times 1=$

If $a\times b=c$, then $b\times a=$?

Give the results without actually performing the operations using the given information.

$58+42=100$ then $42+58=$