quarter back, hafl back, full back
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from A to B and back to A then to B and back to A again
B x A = BA
[(aa + bb) + (ab+ba)(aa+bb)*(ab+ba)]*[a + (ab+ba)(aa+bb)*b]
A*B=B*A is an example of the commutative property of multiplication.
i think they mean 3/4 of an hour which would be 45 minutes. Or in music if the time signature is 3/4, then each measure will have 3 quarter notes. The music might have a rhythm like 'bum ba ba bum ba ba . . . . .'