The cost for a admission is $10 and the cost per ride is $2. If you want to find the total cost for a admission and r rides, you need to multiply the cost per ride by the number of rides and then add the admission fee. So the total cost would be:
Total cost = $10 + $2r
For example, if you wanted to find the total cost for 5 rides, you would substitute 5 for r in the equation:
Total cost = $10 + $2(5) = $20
So the cost for 5 rides and one admission would be $20.