On monday joe bought 10 cups of coffee and 5 doughnuts for his office at the cost of $16.50. it turns out that the doughnuts were more popular than the coffee. on tuesday he bought 5 cups of coffee and 10 doughnuts for a total of $14.25. how much was each cup of coffee?

Acommercial passenger jet can travel up to 970 km/hr at an altitude of 30,000 feet. at this speed, how long will it take the jet to travel 1,865 kilometers? a. 2.3 hrs b. 1.9 hrs c. 1.7 hrs d. 1.5 hrs

Work = force × a. work b. energy c. distance d. momentum

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?