15 points. please help
Find the simplest form of √7x^2-14x+7

Giving ad is congruent to bc and angle bcd is congruent to angle adc prove d e is going to ce

Find x & pleeeeaaaassseeee me !

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?