What does the last line of a proof mean

In which source of water would a wave travel the fastest? o ice o cold o room temperature o hot mark this and return save and exit next

Of four points are collinear, they are also coplanar

Sh what is the value of x? ox= 2.25 x = 11.25 ox= x = 22 1 (2x + 10) seo - (6x + 1) -- nie