Please answer these 2 questions

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

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 =