In 2011, the IRS increased the deductible mileage cost to 52 cents from 40 cents. Find the percent increase. (Round your answer to the nearest tenth of a percent.)

Can someone me out here number 4 plz

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.

How do i put 3(x+7) in distributive property