A Web music store offers two versions of a popular song. The size of the standard version is 2.2 megabytes (MB). The size of the high-quality version is 4.8 MB. Yesterday, there were 1,230 downloads of the song, for a total download size of 4110 MB. How many downloads of the standard version were there?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Can someone me with the property questions for 12 13 and 14 plz

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?