Is -81+-9 positive or negative?

Is the sentence true or false?

When adding unlike signs, take the difference (subtract) and keep the sign of the higher number.

Is -60+6 positive or negative?

Is the sentence true or false?

When adding unlike signs, take the difference (subtract) and keep the sign of the lower number.

Is 6+66 positive or negative?

Is -8+-9 positive or negative?

Is 66+-26 positive or negative?

Is 16+26 positive or negative?

Is -40+6 positive or negative?

Is 26+-16 positive or negative?