\[ 1 \; \square \; 2 \; \square \; 4 \; \square \; 8 < 0\]

Which of the following series of signs are appropriate for the three boxes above?

If you fill in the blanks with \(+ \) and/or \(-\) only, how many \(+ \) do you need to use to make this equation true?

\[ 2 \; \square \; 5 \; \square \; 6 \; \square \; 7 = 10\]

\[1 \; \square \; 1 \; \square \; 1 \; \square \; 1 \]

If we fill in the above blanks using only the operators \(+ \) and/or \(-\), which of the following \( \color{red} { \text{cannot} } \) be a resultant number?

\[9 \; \square \; 7 \; \square \; 5 \; \square \; 3 \]

If we fill in the above blanks using only the operators \(+ \) and/or \(-\), the resultant number will always be an \(\text{__________} \).

\[ 2 \; \square \; 3 \; \square \; 3\; \square \; 6 = 2 \]

Which of the following series of signs are \(\color{red}{\text{not}} \) appropriate for the three boxes above?

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