Evaluate 1/3 m- 1- 1/2 n when m=21 and n=12

What can be said about the relationship between triangles and circles? check all that apply. a) many circles can be inscribed in a given triangle b) exactly one triangle can be inscribed in a given circle c) exactly one circle can be inscribed in a given triangle d) many triangular shapes can be circumscribed about a given circle

(hurry! ) which expression is equivalent to the following complex fraction?

What is the interquartile range of this day at set?