Find the value of c using the given chord and secant lengths in the diagram to the right ... please help me on this I don’t understand it

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.

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

George writes the mixed number as sum and uses the distributive property 1/2.-2/5=1/2-2+2/5=1/2