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?

What is the slope of a line - 3x + 20y = 40

Who are the eleven supernovas

What is the value of x in the equation 2/3 (1/2x + 12) = 1/2 (1/3x + 14) - 3?

A triangle has two sides that measures 7 cm which of the following cannot be the measure of the third side

Which expression is equivalent to the given expression? 8 (34a) - 8 34a34a 6a 8 (34a-1) 8 (34a-1) 34a-1

What is the quotient when root 1500 is divided by 2 root 15

1 eighth the sum of 23 and 17

What is the median of the following data set? {6, 3, 9, 1, 7}

The function f (x) = 18000 (0.52) x represents the value in dollars of a vehicle x years after it has been purchased new. What is the average rate of change in value per year between years 4 and 8? -$18000/year -$1219.87/year -$304.97/year -$0.

4x-6y=2 3x+5y=11 Jonas used the linear combination method to solve the equation shown. He multiplied the first equation by 3, and the second equation by another number to eliminate the x terms. What number did Jonas multiply the second equation by?