If mean of x and 4x is 10 and value of x is

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 .

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²