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UsingGCFandDistributive propertyon the sum of 42 and 66 gives us;((6 * 7) + (6 * 11) = 6(7 + 11)GCFsimply means thegreatest common factor. Now, to find the GCF of 42 and 66, let us state their factors;Factors of 42= 1, 2, 3, 6, 7, 14, 21, 42Factors of 66= 1, 2, 3, 6, 11, 22, 33, 66The highest factor common to 42 and 66 is 6. Thus, we can say that the GCF of 42 and 66 is 6.We want to add 42 to 66.42 + 66Thedistributive propertystates that;a(b + c) = ab + acThus;Since GCF of 42 and 66 is 6, then we have;42 + 66 = ((6 * 7) + (6 * 11)Using distributive property;((6 * 7) + (6 * 11) = 6(7 + 11)Read more at;brainly.com/question/17846825...