Approximately 9 out of 10 smokers began smoking before the age of 21. in a group of 400 smokers, about how many of them started before they reached their 21st birthday?

step-by-step explanation:

. your answer will contain x - and y -terms. (1 point) x ( ¿¿ 2 − 7 ) 2 +( y 2 − 9 ) 2 √ ¿ 12. what is the distance from the directrix (the crocodile river) to the point ( x , y )? write this equation. your answer will contain a y -term.