(a)

Let $\"\"$ is percentage of Americans under the age of 18 at time $\"\"$ .

$\"\"$ is rate of change of percentage of Americans under the age of 18 with respect to time $\"\"$ and the units are percent per ten years.

Rate of change : $\"\"$ .

Here $\"\"$ years.

(b)

Consider a table of values for time and $\"\"$ .

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

\ $\"\"$ \	\ $\"\"$ \
\ $\"\"$ \	\ $\"\"$ \
\ $\"\"$ \	\ $\"\"$ \
\ $\"\"$ \	\ $\"\"$ \
\ $\"\"$ \	\ $\"\"$ \
\ $\"\"$ \	\ $\"\"$ \
\ $\"\"$ \	\ $\"\"$ \

(c)

Graph the functions $\"\"$ and $\"\"$ .

Graph the function $\"\"$ with given values :

$\"\"$

Graph the function $\"\"$ with obtained values in the above table.

$\"\"$

(d) If the data provided for consecutive years like 1959 and 1960 to compute $\"\"$ , then there is a possibility to get more accurate results of $\"\"$ .

(a) $\"\"$ is rate of change of percentage of Americans under the age of 18 with respect to time $\"\"$ and the units are percent per ten years.

(b)

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

\ $\"\"$ \	\ $\"\"$ \
1950	\ $\"\"$ \
1960	\ $\"\"$ \
1970	\ $\"\"$ \
1980	\ $\"\"$ \
1990	\ $\"\"$ \
2000	\ $\"\"$ \

(c)

Graphs of the function $\"\"$ is :

$\"\"$

Graphs of the function $\"\"$ is :

$\"\"$

(d) If the data provided for consecutive years , instead of ten years then there is a possibility to get more accurate results of $\"\"$ .