Aposter is to have a total area of 500 square centimeters. there is a margin around the edges of 7 cm at the top and 7 cm on the bottom and sides where nothing is printed. express the printed area a in terms of the width w (in centimeters) of the bottom.

Explanation:

Take a look at the picture I attached you. The Rectangle area is given by:

Where:

The total area of the poster is 5m^2, so:

Isolating h:

 (1)

Now, the printed area would be the product between w and h minus the length of the margins, therefore:

 (2)

Replacing (1) in (2) and applying distributive property:

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.