Question

select all the expressions that are equal to 0. -1 + (-1) -7 + 7 9 + (-9) -3 + 3 submit

Explanation:

Step1: Evaluate \(-1 + (-1)\)

Adding two negative numbers: \(-1 + (-1) = -2\), which is not 0.

Step2: Evaluate \(-7 + 7\)

A number and its additive inverse sum to 0: \(-7 + 7 = 0\).

Step3: Evaluate \(9 + (-9)\)

A number and its additive inverse sum to 0: \(9 + (-9) = 0\).

Step4: Evaluate \(-3 + 3\)

A number and its additive inverse sum to 0: \(-3 + 3 = 0\).

Answer:

The expressions equal to 0 are \(-7 + 7\), \(9 + (-9)\), and \(-3 + 3\). So the correct options (assuming the checkboxes are for these) are the ones with \(-7 + 7\), \(9 + (-9)\), \(-3 + 3\).