Respuesta :

Answer:

D   6

Step-by-step explanation:

Area = L × W

(2n + 1)(6) = 78

(6 × 2n) + (6 × 1) = 78

    12n  + 6 = 78

     12n = 78 - 6

     12n = 72

        n = 72/12

        n =  6 cm

     

jeffordsash

Answer:

6

Step-by-step explanation:

You have to insert each of the numbers in place of n and do the equation to see if it adds up to 78.

2(6) + 1 = 78

the others do not equal 78, therfore n = 6

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