The function is $\"\"$ .

(a).

Find the maximum point of the function.

Graph of the function $\"\"$ :

$\"\"$

Observe the graph:

The maximum point of the function is approximately $\"\"$ .

After $\"\"$ hours the concentration of the medicine is highest.

(b).

The concentration is below $\"\"$ .

$\"\"$

Substitute $\"\"$ in $\"\"$ .

$\"\"$ .

Solve the above equation graphically.

Graph : \ \

Graph the function $\"\"$ .

Draw a horizontal line at $\"\"$ .

Observe and label the points.

$\"\"$

Observe the graph:

The horizontal line intersects the curve at $\"\"$ and $\"\"$ .

After taking medication, she will have to wait at least $\"\"$ hours before feeding her child.

(a). $\"\"$ hours.

(b). $\"\"$ hours.