Find the third side of TriangleABC with AB = 40 cm, BC = 25 cm and BAC = 39 ​

Find the missing factor. 7s2 + 25s + 12 = (s + 3)( ).

What is the vertical asymptotes of the function f(x)=x-2/x*2-3x-4

Given that de, df, and ef are midsegments of △abc, and de=3.2 feet, ef=4 feet, and df=2.4 feet, the perimeter of △abc is .