Identify the number marked as (?) in the numerical series below: 5,3, 2, 6, 7, 9, 1,15, 4, 2, 3, 3, 9,5, 1, (?)

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

Aline that intersects one of two parallel lines intersects the other also always sometimes never

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.