n the early 1990s, 7,000 elderly Dutch men and women were included in a prospective cohort study (follow-up is involved). A number of participants were lost to follow-up during the course of the study and no information was available on those after they were lost to follow-up. The investigators computed how many person-years each participant had contributed to the study until January 2000. The total was 56,232 person-years. During follow-up, 1,890 of the participants died, and of these, 950 were due to coronary heart disease. What is the coronary heart disease specific mortality rate/density of participants in this cohort

The coronary heart disease specific mortality rate/density of participants in this cohort

= 13.57%

Step-by-step explanation:

a) Data and Calculations:

Total participants in the cohort = 7,000 persons

Total person-years contributed = 56,232

Death during follow-up = 1,890

Number of death due to coronary heart disease = 950

Mortality rate/density of participants in this cohort

= 950/7,000 * 100 = 13.57%

b) The result suggests that 13.57% of the 7,000 participants died during follow-up out of coronary heart disease.  This number represents about 50% (950/1,890 * 100) of all deaths recorded during follow-up.

on friday there were 15 birds

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2