Sahana has only blue and yellow fish in her aquarium. If 25% of the fish are yellow, what is the ratio of the number of BLUE fish to that of YELLOW fish? Help

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Which of the following is the result of expanding the series

Which number completes the inequality? 2/3 < _ < 7/9