Help with 11 pls, thank you

What expression is equivalent to 42x-56y

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Prism m and pyramid n have the same base area and the same height. cylinder p and prism q have the same height and the same base perimeter. cone z has the same base area as cylinder y, but its height is three times the height of cylinder y. the figures and have the same volume.