Astrophysical theory suggests that a burned out star will collapse under its own gravity to form a blackhole when its mass is at least three solar masses. If it does, what is the radius of its event horizon? (solar mass=1.99×10^30kg)

when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.

the right answer is: time