60% of the total runners in the marathon finished the
race. If 30 runners finished, then how many runners
total ran the marathon?

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?

Calculate the density of benzene if 300ml of it weighs 263g. a. 0.88 g/ml b. 1.14 g/ml c. 78,900 g/ml d. 37 g/ml

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?