Step-by-step explanation:
Answer is $17.5
It says Mrs. Samuelson had $350 to spend on a field trip for herself and 18 students. so there are 19 people. Multiply 12.50*19 you get 237.5.
It also says lunch cost about $5.00 per person. Multiply 5.00*19 you get 95.
Add 95 to 237.5.
You get 332.5
Subtract 350 by 332.5.
Equation: 350-(19*12.50)+(19*5.00)
Answer: $17.5