Weasel asked:


And also, why do we have to cover the transparency when I’m done using it? For safety reasons or just to cover the light? Please help and thanks in advance I’m new to this :I

Anonymous asked:


technological resources: telephones, fax machines photo copiers, over head projectors etc.

for each type of machinery i need say the use for each one, why its more effective and its performance.

pick one or more and help me plz