Sam multiplied 2.1515 by 3.2125 and made the conclusion that the product of two rational numbers is rational. is sam correct? explain.

Sam is not correct because a rational number is natural numbers, whole numbers and integers, like 5, are all part of the set of rational numbers. And the answer Sam should of got is 6.91 .

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart

we can't see all full 4 options, but if this is the full option, than the very left one is correct:

-2/5 * -3 3/4

remake the question, adding a picture of all the question, or write down the full left and right answers.