I need help with this I need to know whats the expression and explanation, I will give the brainliest who answers and explains good

Answer:The area of the picture frame in simplest form is given as (48x + 216) sq. inchesStep-by-step explanation:The width of the picture frame = 12 inNow, the length of the frame = (x + 6) +  (x + 6)+  (x + 6) + x= (x + x + x + x) +  (6 + 6 + 6) = 4x + 18Now, the AREA OF THE RECTANGLE = LENGTH X WIDTHSo, here the area  of the picture frame =  ( 4x + 18 )  X 12 inAlso, by DISTRIBUTIVE PROPERTY:A(B+C)  = AB + ACSo, the area =   12  ( 4x + 18 )   = 4x (12) + 18 (12)                     = 48x + 216Hence, the area of the picture frame in simplest form is given as (48x + 216) sq. inches