The perimeter of an envelope is 34 inches. It is 11 inches wide. How tall is it?​

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

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2