Shawn conducted an experiment and did not get the results he was expecting. What should he do first?

A) Shawn should write conclusions.
B) Shawn should share his results.
C) Shawn should explain what he thought should have happened.
D) Shawn should check his experiment for errors and try again.

he should explain what he thought should happened and check his experiments for errors and try again

Mark me as brainliest

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