Respuesta :

A contrapositive statement reverses both the hypothesis and the result.

In this case, it would become:
If my mom does NOT have to work, then I do NOT babysit my little sister. 

Answer: If my mom does not have to work, then I do not babysit my little sister.

Step-by-step explanation:

The contrapositive of a statement of the form " If a then b" is given by :-

"If not a then not b."

The given conditional statement :" If my mom has to work, then I babysit my little sister.”

Then the contrapositive statement of the conditional statement will be

"If my mom does not have to work, then I do not babysit my little sister.”