If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 56 days?

a. they are both space stations

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i just learnt this recently but i need to look through my notes again

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