Most reactions give off energy in the form of heat and are called what

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

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