Wich set of shapes contains members that are always similar to one another

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

Twelve less than a number is at most 20

Which of the following questions describes the equation g + (-4) = -5? a)what number, when added to negative four, is equal to negative five? b)what number, when added to negative five, is equal to negative four? c)what number, when subtracted from negative four, is equal to negative five? d)what number, when subtracted from negative five, is equal to negative four?