You are buying a gym membership. The membership costs $\$30$ per month. In the graph at the bottom of the page, $d$ is the total number of dollars that you pay for your gym membership, and $t$ is the time (in months) that you keep the membership. **Write an equation for the amount of money, $d$, that you pay for your gym membership if you keep the membership for $t$ months. ** [[☃ expression 1]] **Then, complete the table below for the missing value of $d$.** $t$ | $d$ :-:|:-: $1$ | $30$ $2$ | $60$ $3$ | $90$ $...$ | $...$ $24$ | [[☃ input-number 1]]