For positive acute angles A and B, it is known that sin A = 21/29 and cos B = 7/25. Find the value of sin(A + B) in simplest form.

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.