Question

Help me please please explain this to me
Thanks

Answer 1

6

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

Answer 2

D 6

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