Can someone plz help me Would you use the greatest common factor or the least common multiple to add to fractions? In example, what is it ? 6/12 + 3/9

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?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Percy rides his bike 11.2 miles in 1.4 hours at a constant rate. write an equation to represent the proportional relationship between the number of hours percy rides, x,and the distance in miles, y, that he travels.