2. Using the calculator, work out which operation sign ( + or - ) needs to be In each block. For which number sentences could you not use enther + or - ? a) \( 58610 \square 134457=93067 \) b) \( 130567 \square 174356=56211 \) c) \( 248344 \square 153446=94898 \) d) \( 679488 \square 335221=344267 \)

To solve the equations, we can use the properties of addition and subtraction. For a), if you calculate \( 58610 + 134457 \), you get \( 193067 \) which does not match. But if you do \( 58610 - 134457 \), it has a negative result, making it impossible. Similarly, for b) and c), both would lead to exponential results using addition while subtraction goes negative. However, d) works with subtraction as \( 679488 - 335221 = 344267 \), affirmatively using minus. Hence, any sentences where results draw negatives confirm no viable operation exists. In summary, some number sentences might become impossible if the required operation leads to an absolute result that cannot equal either operand logically through operations suggested here.