Example 2: smoking and asthma
health officials in milwaukee, wisconsin, were concerned about teenagers with asthma. people with asthma often have difficulty with normal breathing. in a local research study,
researchers collected data on the incidence of asthma among students enrolled in a milwaukee public high school.
students in the high school completed a survey that was used to begin this research. based on this survey, the probability of a randomly selected student at this high school
having asthma was found to be 0.193. students were also asked if they had at least one family member living in their house who smoked. the probability of a randomly selected
student having at least one member in his (or her) household who smoked was reported to be 0.421.

the first one, all those points on the line just make a strait line.

10 - 8 = -2

  8 - 6 = -2

etc, so -2 is the common difference

step-by-step explanation:

third choice down

step-by-step explanation:

the first inequality is based on the number of adults and campers, and the second inequality is based on the cost of feeding both the adult and the camper.

we know that there is room for 525 people max.   it's ok to have less than 525, but it's not ok to have more than 525, so the inequality is less than or equal to.   the number combination of adults (x) and campers (y) cannot exceed this 525 max.   therefore:

x + y ≤ 525

now we talk about cost.   it costs $9 to feed one adult, so depending upon the number of adults you have (x) depends upon how much it will cost to feed that number of adults.   same with the campers, who cost $5 to feed.   the adults can be represented by 9x and the campers can be represented by 5y.   since the budget cannot exceed 1,200, the second inequality is:

9x + 5y ≤ 1200