Example of Uniform Acceleration?

Kimmy is running with a Final velocity of 19 m/s. She has been running for 0.3km with an acceleration of 6 m/s². Whats her Initial Velocity? First Converge. 0.3 km= 300m. Now get the formula f²-i²=2xAxD [19]² - [i]² = 2 x 6 x 300. i² = [2 x 6 x 300] - [19²] i² = 3239 i = 56