Graph the inequality on the number line. x≥−3 1/2

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 .

Whats the name of the vertical axis

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane