A billboard designer has decided that a sign should have 4-ft margins at the top and bottom and 2-ft margins on the left and right sides. Furthermore, the billboard should have a total area of 500 ft (including the margins). If denotes the width (in feet) of the billboard, find a function in the variable giving the area of the printed region of the billboard.

For all functions , if is continuous at , then is also differentiable at .

For all functions , if is continuous at , then is in the domain of .

For all functions , if  is defined at , then  is also continuous at .

Which of the following is a sign a child may be neglected?

After evacuating a building in an emergency, an early childhood educator should take roll call.

To keep children safe from sun damage, early childhood teachers should do which of the following?

A special permission form is usually required for all of the following activities except ____.

Children may have trouble identifying sexual abuse, especially with people they know.

All of the following are possible signs of physical abuse except the child ____.