What is 1 + 1? I forgot

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line