A prism measures base 15cm. Height 100mm. Length 40cm. Calculate volume of prism cm3

The volume of the prism depends on the shape of its base. Since you haven't mentioned whether the base is a triangle or a rectangle, I'll solve it both ways.

1 - If the base is a rectangle:

volume = length x width x height = 15 x 10 x 40 = 6000 cm^3

2 - If the base is a triangle:

volume = area of base x height = (0.5 x 15 x 40) x 10 = 3000 cm^3