What are some mixtures in a classroom

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?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

How much heat is needed to raise the temperature of 5g of water by 16°c?