13. Which of the following groups of simple machines represent variations of an inclined plane? a. pulley, lever and wedge
b. pulley, wheel and axle
C. Screw and wedge
d. wheel and axle, screw

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

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?