<span>Young
infants cannot appreciate the carnival game in which a pea seems to
disappear from under a walnut because they have not yet developed a
sense of</span> "Object permanence".
I think it the answer is B
The steps that a nurse should take when helping a child to use the metered dose inhaler is to ensure that the rubber ring has ben opened and that the tube faces upwards.
<h3>What is the MDI?</h3>
The term MDI is an acronym and it stands for metered dose inhaler. This allows the users of the device to monitor the amount of the substances that is inhaled by the patient that is using it.
Hence, the steps that a nurse should take when helping a child to use the metered dose inhaler is to ensure that the rubber ring has ben opened and that the tube faces upwards.
Learn more about metered dose inhaler:brainly.com/question/4297734
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Based on the results of the study shown below, the epidemiologist has reason to worry because the incidence rate increased over four times the previous level as shown below:
- number of HIV cases = 440 persons
- new incidence rate = 2.25 per 1000 persons
<h3>What is prevalence and incidence rate?</h3>
Prevalence rate is the proportion of persons in a population who have a particular disease or attribute at a specified point in time or over a specified period of time.
- Prevalence rate = number of cases/total population × 100%
Incidence rate is the proportion of new cases of a condition observed within a given period of time.
- Incidence rate = number of new cases/population at risk × 1000
- population at risk = total population - previous cases
The number of people who had HIV in January 2012 is calculated as follows:
- number of HIV cases = prevalence rate × total population
number of HIV cases = 2.2% × 20000
number of HIV cases = 440 persons
Incidence rate between February 2012 and January 2013 is calculated as follows:
Incidence rate = 50/(20000 - 440) × 1000
Incidence rate = 2.25 per 1000 persons.
Based on the new incidence rate, the epidemiologist has reason to worry because the incidence rate has increased over four times the previous level.
Learn more about prevalence and incidence rate at: brainly.com/question/27108142
