Poate s-a ma ajute cineva? Pana intr-o ora, va rog.

Which problem could be  solved  by evaluating the expression  7×(−3)7×-3?

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 .

Can someone check if i did this correct. it’s number 4 if you’re wondering.