Need these solved ASAP please

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

This drawing shows a human body system. what is the primary function of this body system?

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest