I am DESPERATE I WILL DI toy train blocks made of 6 inches long or 7 inches long can be hooked together to make longer trains. which of the following train-lengths cannot be by hooking together either 6 inch tran cars, 7 inch cars, or a combination of both: 29 inches, 30 inches, 31 inches, 32 inches, 33 inches

29

Step-by-step explanation:

6 or 7 inches

29 can't be

30 can be 6*5

31 (1*7)+(4*6)

32 can be (2*7)+(6*3)

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29 inches

Step-by-step explanation:

For the following I just used trial and error and experimented with the possibilities:

29 inches - This is the only one that does not work.

30 inches - We can use 5 of the 6 inch trains, so this is possible.

31 inches - We can use 4 of the 6 inch trains and 1 of the 7 inch trains, so this is possible.

32 inches - We can use 3 of the 6 inch trains and 2 of the 7 inch trains, so this is possible.

33 inches - We can use 2 of the 6 inch trains and 3 of the 7 inch trains, so this is possible.

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step-by-step explanation: