You can start a mechanical wave by?

they are made of gases.

they have a spherical shape.

they make energy through fusion.

the answer is 303.15 or 303

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