If part of a circle is 60 and one is 135 what the other two parts​

Rai compares two cable plans from different companies. which equation gives the correct value of mm, the number of months for which plans a and b cost the same?

Solve 2x+y=3 x+y=5 in substitution method

What is the interquartile range of this data set? 2, 5, 9, 11, 18, 30, 42, 48, 55, 73, 81