Can someone explain this to me plz?!

1). Write a mathematical equation showing that pressure (P) divided by temperature (T) remains equal to a constant (k).

2). Write a mathematical equation showing that volume (V) divided by temperature (T) remains equal to a constant (k)

Which expression will have the same sum as 3_8 + 1/4?

What is the value of x in the this question ?

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect