Marc, a high school senior, was given an eighth-grade science exam and he scored 85%. is this an accurate predictor of how well students in the eighth-grade science class will perform on the exam?

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No, he is not a Representative of the eighth grade population

Step-by-step explanation:

Marc is a high school senior so he cannot represent eight grade.

y do u put "subscirbe to ence" on a app for ppl who need with their work?

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.