Public Law 89-313 was passed in 1965. It is also known as The Elementary and Secondary Education Amendments of 1965. It is an amendment to the Elementary and Secondary Education Act of 1965 ( ESEA also known as PL 89-10). PL 89-313 authorized the first grants to the states for children with disabilities.
A source for more information:
http://students.ou.edu/W/Lori.H.Wylie-1/Legislation.html
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L = P/2 - W.
P waves... L waves are slowest.
Let P be perimeter, A is area, L is length, and W is width.A = L x W, P = 2L + 2W; you know P and W, so L = (P - 2W)/2and A = W x (P - 2W)/2
P/L% = P/L * 100 divide by C.P
If we're talking Width, Length and Perimeter then W = P/2 - L