In a certain chemical, the ratio of zinc to copper is 4 to 13. Ajar of the chemical contains 481 grams of copper. How many grams of zinc does it contain? It contains grams of zinc.​

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

answer is c.

quadrilateral

hope you got it chief