Step-by-step explanation:
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Answer: 1600m^2
Its a square so all sides are equal. So...
400m * 400m
= 1600m^2
Hi Ivan
-6n - 20 = 2n + 4(1 - 3n)
-6n - 20 = 2n + 4 - 12n
Combine like terms
-6n - 20 = 2n - 12n + 4
-6n - 20 = -10n + 4
-6n + 10n = 4 + 20
4n = 24
n = 24/4
n= 6
I hope that's help! If you have any further questions please let me know !