Need some with this physics question?
a new car model is described as having 340 horsepower. at this horsepower, the car’s engine produces 900 kilowatts of heat as it operates. what is the engine’s efficiency?
a) 22%
b) 28%
c) 37%
d) 46%

The only piece of information you need that the question doesn't tell you is:

1 horsepower = 746 watts

So 340 horsepower = 253,640 watts

-- The output of the engine is 253.640 kW useful energy and 900 kW waste heat.

-- The engine is using 1,153.640 kW total energy.

-- The useful output is 253.640 kW.

-- Efficiency is (253.640 kW) / (1,153.640 kW)

Efficiency = 21.99 %

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.

i need with 1.3.2 investigate cycling o2 and co2 apex

we need to see it