Problem
4)) A group of neighborhood families are planning a trip to the museum. Tickets are \( \$ 25 \) for adults and \( \$ 10 \) for children. The group also has a coupon for \( \$ 5 \) off. The expression \( 25 a+10 c-5 \) represents the total cost for \( a \) adult and \( c \) child tickets. Monica is purchasing tickets for 5 adults and 9 children. Evaluate the expression to find the total cost. \[ \begin{aligned} 25 a+10 c-5 & =25(5)+10(9)-5 \\ & =\square+?-5 \end{aligned} \]
Solution
Step 1 ：25(5)+10(9)-5
Step 2 ：125+90-5
Step 3 ：210
