Find the value of x then classify the triangle by its angles

Ineed with number 17 i don’t get it at alll

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =