FREMONT, Calif. Telsa Motors delivered the first of its long-awaited Model X electric sports-utility vehicles on Tuesday, a product investors are counting on to make the pioneering company profitable after years of losses. The launch of the Model X represents a milestone for the loss-making Silicon Valley automaker during a period of high spending and modest growth, because it can now boast a second model in production beyond its Model S sedan, launched in 2012.…