Letters are used in algebra in place of an unknown number, giving us algebraic terms like 2x. When algebraic terms are combined with mathematical operations, eg + or - we get an algebraic expression.
If is the cost of admission for one child to the zoo, what is the cost for children?
A family of children and adults visit their local zoo. If represents the cost of admission for one child and represents the cost for one adult, what is the total cost of admission for the family?
What is ?