Question

who gives me this answer
I mark him as brainlist but send whole solution​

Answer 1

Answer:

$= = =$

your answer make me brainleast

Answer 2

$\frac{y - 1}{4} - \frac{y + 2}{3} = 4$

Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons but different numbers of neutrons in each atom.