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What is the y-intercept of the graph of the equation y=3(2^x)

Refer to interactive solution 17.45 to review a method by which this problem can be solved. the fundamental frequencies of two air columns are the same. column a is open at both ends, while column b is open at only one end. the length of column a is 0.504 m. what is the length of column b?

What is the result of adding the system of equations? 2x+y=4 3x-y=6