Suppose we have universal set U. What does it mean to say that X is a subset of U?

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)