## Elementary Algebra

Hector has $p+5n+10d$ cents.
We multiply $10$ by $d$ because each dime is worth $10$ cents, multiply $5$ by $n$ because each nickel is worth $5$ cents, and multiply $1$ by $p$ because each penny is worth $1$ cent. We then must add these three numbers to get the total number of cents that he has: $p+5n+10d$.