Question

Please explain this to me please

Answer 1

n = 6cm

Explanation:

L × W = Area

6(2n + 1) = 78

12n + 6 = 78 Distributive

-6 = -6 Subtract -6 from both sides

12n = 72 Addition

`(12n)/(12) = (72)/(12)` Divide each side by 12

n = 6cm