Engineers create systems that are ALWAYS perfectly efficient. Is this statement true or false? y
True
False

no but i do not usually comment or use my voice that much when it comes to social media

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

the answer is c. nacl