Number of new chronic bronchitis cases due to air pollution occurring between January 1 and June 30, 2012= 26 Number of active chronic bronchitis cases due to air pollution according to the city register on June 30, 2012= 264 Find the incidence rate per 100,000 population of chronic bronchitis cases for the 6 months period.

Incidence rate=0.00026

Step-by-step explanation:

Incidence rate is the rate of new occurrence of a particular disease divided by the population of people at risk of the disease.so for this question

The new cases= 26

Population at risk =100,000

Incidence rate = 26/100,000

= 0.00026

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10