How would you solve these questions?

These functions exists (and are invertible) as long as the denominators are not zero: so we want

for , and

for

Now we show that they are inverses of each other: we want to show that

. Let's start with . We have

And in the very same way we show that

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

the correct answer is 5 6 and 7