Accreditation of laboratories that do forensic investigations is (multiple answer) always required done voluntarily done using independent nongovernmental agencies such as astm and iso done by a special government agency to insure uniformity of testing and results across all laboratories is never done since this is expensive and does not improve the results obtained by the laboratory

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.