Complete the proof. Drag and drop the expression to correctly complete the proof of the polynomial identity (x−y)2+4xy=(x+y)2.

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

What is the value of x in the diagram below?

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?