X, − 7,-6,-5,-4
y,21,17,13,9

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.