If 2 hours of TV had 40 commercials, how many commercials were in 1/2 hour?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

Determine the fraction of total interest owed. after the fourth month of a 12-month loan: the numerator is: {(n + ) + (n + ) + (n + ) + (n + )} = , and the denominator is: {(n) + (n + 1) + + (n + )} = . therefore, the fraction is numerator/denominator (to the nearest tenth) =