To find the volume of the prism, use the formula:
v = (1/2)(a)(c)(h)
a = height of the triangle
c = base of the triangle
h = side of the rectangle (not connected to the triangle).
1/2(14 x 7 x 4) = V
Simplify. Follow PEMDAS
1/2(392) = V
Simplify. Multiply 1/2 with 392 (or divide by 2)
392(1/2) = V
392/2 = V
V = 196
196 is your volume of the prism.
hope this helps