Elimination or subtraction method to find the solution of Y=10x+24 and y=15x-75

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?

Which expressions are equivalent to k/2 choose 2 answers: a k-2 b 2/k c 1/2k d k/2 e k+k

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?