Write on addition equation with a variable to
9
Jack has 2 more
cookies then Carson
Jack has 5 cookies. How
many cookies does
Carson have?

$250 deductible means jane must pay the first $250 of her bill. so the insurance company paid = (80% of bill) - deductible = (0.8 x $2550) - $250 = $2040 - $250 = $1790 and jane's cost is = (bill) - (insurance payment) = $2550 - $1790 = $760

The additive identity is 0 because when you add 0 to a number, you get the identical number as an answer.a + 0 = a