7) Norachai spent $13 on a magazine and some erasers. If the magazine cost $4 and each eraser cost $3 then how many erasers did
he buy?

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.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

The angles in a triangle are represented by 5x, 8x, and 2x+9. what is the value of ? a.10.8 b.11.4 c.9.7 d.7.2