He cost for children under twelve at a certain buffet restaurant is a base charge of a dollar plus twenty-five cents for each year of the child's age. Represent this cost as an expression, using y to stand for the child's age in years. Then use the expression to find the cost for a child who is nine. 0.25 + y ; $8.75
1 + 0.25 y ; $3.25
0.25 + y ; $9.25
1 + 0.25 y ; $2.25