Answer:
a square
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Answer:
I cant do them all for you, but essentially every equation there is an a, plug in 10 for a. Every equation  with b, plug in 9 and every equation with c plug in 4. Then Solve/simplify
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Answer:
do it your self.
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Answer:
20%
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Answer: there were 12 chocolates in each box. (Originally, before any got eaten)
Step-by-step explanation: let x represent the total amount of chocolates in each box. 
8x - 3(8) = 72
8x - 24 = 72 add 24 to both sides 
8x = 96 divide both sides by 8
X = 12