Sarah and Lisa would spend an equal amount per month if they each downloaded movies the amount they would spend is $ The first option is either 5,6,15
the second options are 5,10,15

i don't even know how to read that, ill try to do it if you translate it into english.

a magnifying glass is a convex lens which produces a magnified image of an object. for a magnified image to be observed the distance between the object and the lens has to be shorter than the focal length of the lens.