Weekly sales of graphing calculators can be modeled by the equation s(t) = 10-te-t/20 where s is the number of graphing calculators sold per week after t weeks. How many graphing calculators will be sold in the first 80 weeks? calculators (include two decimal places)

This value represents how much a change in one variable can be predicted from its relationship witha completely different variable .......

The cost of fuel is the largest component of cost of ownership for most vehicles. Fuel cost is​ (almost) inversely proportional to gas​ mileage; higher gas mileage means lower fuel cost and​ vice-versa. If you keep track of the number of miles driven on each tank of gas as well as how much gas is​ purchased, it is easy to calculate gas​ mileage; many cell phone apps exist to track this. The data in the following table is the gas mileage for Mr.​ Hebert's 2015 Jeep Wrangler Unlimited.     12.85 14.98 15.36 17.09 18.86 13.28 15.11 15.62 17.50 19.07 13.48 15.12 15.65 17.66 20.91 14.65 15.13 16.41 18.17 21.17 14.71 15.14 16.80 18.27 22.11   a. Find the average fuel economy. x =enter your response here ​(Round your answer to 3 decimal​ places.)