You are buying boxes of cookies at a bakery. Each box of cookies costs $\$4$. In the graph below, $c$ represents the number of boxes of cookies you buy, and $d$ represents the amount the cookies will cost you (in dollars).
**Write an equation for the amount the cookies will cost you, $d$, when $c$ is the number of boxes of cookies you buy.**
[[☃ expression 1]]
**Complete the table for the missing values of $d$.**
$c$ | $d$
:-:|:-:
$1$ | $4$
$2$ | [[☃ input-number 1]]
$3$ | [[☃ input-number 2]]
$4$ | $16$
