9. birthday??
15 coins are placed in a straight line at the intervals of 2 meters. In the
same straight line a basket is placed and the first coin being 5 meters from
the basket. A person starts from the basket, brings the coin one by one
and deposits them in the basket. Find the distance he has traveled.​

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.