The answer for your question is C. $362.50
The cost to mail a letter today is $0.52 and the rate of inflation each year is 2%. In 40 years, how much will you have to pay?
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If the matrix is of 2 by 2 then we can find the determinant of the matrix.
Then (ad - bc ) gives you the determinant of the matrix.
For example,
= (2)(-2) - (1)(4)
= - 4 - 4
= -8