400 / 10 = 40.
40
X 9
= 360
In a group of 400 smokers, about 360 of them started before they reached their 21st birthday.
Answer:

Step-by-step explanation:
distance formula:
set square to be centered on the origin and find the distance between 2 of the connected points

= 
= 
multiply by 4 as it is a square and all of its sides are equal

insert units

Answer:
x = 96
Step-by-step explanation:
3/8x = 36
You have to multiply both sides of the equation by the inverse of the fraction to cancel it out.
(8/3)(3/8x) = (36)(8/3)
x = 96
Can you show me the drop down menus so I could help you
She bought two pounds of turkey and one pound of cheese