The force that stops a jet plane as it lands on the flight deck of an aircraft carrier is provided by a series of arresting cables . These cables act like extremely stiff rubber bands, stretching enough to keep from slowing the plane down too suddenly. How large is the unbalanced force that the arresting cables exert on the plane ?

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

the answers would be

the first one and the second one

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