Would it be written as

±a=11
or
a=±11

help

Ican't do any of the other stuff, but i can get you started. the answer, i believe, is $2.50.

$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