Seattle-based startup Brinc Drones, founded by 25-year-old Blake Resnick, has raised $75 million in funding led by Index Ventures.The funding brings Brinc's total funding to $157.2 million, with an 'up-round' valuation compared to the previous round.Brinc sells drone systems to police and public safety agencies, aiming to compete with Chinese players in the commercial drone industry.A strategic alliance with Motorola Solutions will integrate Brinc drones into 911 call centers for dispatch during emergency calls.