-5+(-7), i need to kno the answer

Is the figure congruent? yes or no?

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b