Would anyone mind helping? Giving

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Which of the following are correct values for the ideal gas laws constant r

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added