tina is making rectangular signs. each poster has an area of 1800 square inches and the length is 30 inches more than the width. find the length and width of her sign.if x represents the width of each sign, select all of the equations that could be used to solve this problem.2(x)+2(x+30)=1800(x+30)(x)=1800x(30x)=180 0x(x+30)=1800

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.