Mad is the old English term for Mentally disturbed. For example, if you were in England, and you decided to randomly run naked through the town square, they would say that you were "Mad!!" If you were to do that in, say, New York City, perhaps? They would say that you were, "Insane!". However, there is no difference between the two, they have the same meaning.
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Ask your teacher to explain again the difference between area and length...
A square prism is shaped like a cubid. A square pyramid is a pyramid with a square base.
Complementary angles sum to 90o Supplementary angles sum to 180o
Do you mean 1400v + 2v^7 (is 2v to the power 7)? When you differentiate, e.g. 2v^7, you bring the 7 to the front and reduce the power by 1. If so the answer is 1400 + 7*2v^6 (where * means multiply) or 1400 + 14v^6
From any term after the first, subtract the preceding term.