What is the next numbers in the sequence 0, 5, 20, -, -,-​

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

Mr. jones determined that the equation y = 98 - 16/5 x could be used to predict his students' unit test scores, based on the number of days, x, a student was absent during the unit. what was the meaning of the y-intercept of the function? (by the way the 16/5 is a )

Create a quadratic equation that has complex solutions