The seven-person state accountability board tasked with supervising how Maryland’s 24 school districts will implement the landmark Blueprint for Maryland’s Future reform voted Thursday to approve Baltimore City’s plan. The Maryland Accountability and Implementation Board did not offer any conditions for signing off on the plan that Baltimore City Public Schools will use to follow guidelines set by the Blueprint, a 2021 law that will cost the state and local governments billions of dollars over a 10-year period to improve public schools.