Mandy wants to buy a laptop with monthly payments. She will make a down payment of $120 and pay 74 dollars per month
after that. After 12 months, she pays it off. How much was the
laptop?

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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.