. Describe the relationship that exits between circles and lines

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

In the diagram of circle o, what is the measure of zabc?

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.