I am very clueless What is a Brainlist that everyone has been talking about? I need help I kinda new to this and I don't use this often so what is a Brainlist? Plz tell me!

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)