hi, how many teachers have addresses with zip code "918"
select count ( * ) from addresses as t1 join teachers as t2 on t1.address_id = t2.address_id where t1.zip_postcode = "918"
and what is that teacher's email address?
select t2.email_address from addresses as t1 join teachers as t2 on t1.address_id = t2.address_id where t1.zip_postcode = "918"