A number times twenty-five plus 150 is the same as fifty-five time the number

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

What is negative 3/9 times negative 2/8 ?

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?