To find the amount of dollars Gabe spent at the mall you should add the amount he spent on each of the stores.
store 1
[tex]12.97k+23[/tex]store 2
[tex]21[/tex]add both expressions together
[tex]\begin{gathered} 12.97k+23+21 \\ 12.97k+44 \end{gathered}[/tex]To estimate how much it would be if he bought 7 items we must replace k for 7 in the equation
[tex]\begin{gathered} 12.97\cdot(7)+44 \\ 90.79+44 \\ 134.79 \end{gathered}[/tex]he spent $134.79