When a solid such as ice begins to melt, heat energy is added. what is the function of this added heat energy?
a) to increase potential energy
b) to separate hydrogen atoms from oxygen atoms
c) to break the bonds between the individual water molecules
d) to add energy to the hydrogen bonds among water molecules

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 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying