Let 'c' be the number of cones that the coach can buy. Since each ice cream cone costs $2.80, then we have the following expression:
[tex]2.8c[/tex]Now, the coach has $42, then we can write the following equation:
[tex]2.8c=42[/tex]To solve for 'c', we just have to move the coefficient 2.8 to the right side doing its opposite operation: division:
[tex]\begin{gathered} 2.8c=42 \\ \Rightarrow c=\frac{42}{2.8}=15 \\ c=15 \end{gathered}[/tex]therefore, the coach can buy 15 ice cream cones with $42