Ellie go shopping at her local convenience Store and buy the item shown below. In the city she lives in there is a 6.8% sales tax on all items except food. How much money does Ellie the convenience Store? Rounded to the nearest cent if necessary. Paper clips 2.99
Paper towels 1.99
Batteries 4.79
Tortilla chips 3.59
Salsa 3.29

A.$17.31
B.$10.43
C.$13.72
D.$0.66

Explain, the mathematical reasoning and vocabulary, the steps took to solve this problem?

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.

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

Maurice has 54 fewer comic books than rebecca.they have 130 comic books together .how many comic books are in maurices collection ? how many comic books are in rebeccas collection