In a standard Normal distribution, which z-score represents the 20th percentile?

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?