(select all that apply)
1. Calculation errors when distributing 9h
2. Calculation errors when combining h^2 terms
3. Calculation errors when distributing -1
4. Calculation errors when distributing h^2
5. Calculation errors when
To select all the options that apply, we need to go through each option and determine if it is a potential source of calculation errors. Let's analyze each option:
1. Calculation errors when distributing 9h: Distributing 9h involves multiplying 9h by each term inside parentheses. If there are mistakes in multiplying or combining like terms, there can be calculation errors.
2. Calculation errors when combining h^2 terms: Combining h^2 terms involves adding or subtracting terms with h^2. If there are mistakes in adding or subtracting these terms, there can be calculation errors.
3. Calculation errors when distributing -1: Distributing -1 involves multiplying -1 by each term inside parentheses. If there are mistakes in multiplying or combining like terms, there can be calculation errors.
4. Calculation errors when distributing h^2: Distributing h^2 involves multiplying h^2 by each term inside parentheses. If there are mistakes in multiplying or combining like terms, there can be calculation errors.
5. Calculation errors when __________: The option is incomplete and cannot be evaluated without additional information.
Based on this analysis, the options with a potential for calculation errors are 1, 2, 3, and 4. Therefore, you should select options 1, 2, 3, and 4.