The formulas:

Expand the expression:

Plug the values into the expression:
So first start out by writing an expression for the cost of the child and the adult separately.
Child:
6 + 1r ($6 + $1 per ride)
Adult:
10 + 1.5r ($10 + $1.50 per ride)
to find how much more the adult will spend, just do Adult Expression - Child Expression which will be:
10 + 1.5r - (6 + 1r) just simplify this
For Part B, use your equation from part A where r = 7
yea just put a line over the 0 to indicate it's infinite
Answer:
brainly.com
Step-by-step explanation:
sorry my bad copy paste error