In the middle of the century, almost all the physical laws concerning the universe were discovered.​

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

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