Answer:
A
Step-by-step explanation:
So we have the equation:

Subtract 4 from both sides:

Divide both sides by -8:

And we're done!
The answer is A
12
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Answer:
Area = 105.6 square cm
Step-by-step explanation:

P = 4d +dgt
dgt = P -4d
divide both sides by dt.
g = (P-4d)/dt
Try searching for individual answers, you'll have much more luck :)