Thomas can reach both the school and the ice cream parlor in 4 ways by using either the bus or his bicycle.
To find the number of ways that Thomas can reach both the school and ice cream parlor, we need to multiply the number of options he has for each leg of the journey. Let's say Thomas has 2 options for transportation: the bus and his bicycle.
For the first leg of the journey, Thomas has 2 options, so there are 2 ways he can reach either the school or the ice cream parlor.
For the second leg of the journey, he again has 2 options, so there are 2 ways he can reach either the school or the ice cream parlor.
To find the total number of ways, we multiply the number of options for each leg: 2 options x 2 options = 4 ways Thomas can reach both the school and the ice cream parlor.