Step-by-step explanation:

a) 5 cube ×(-15)cube

it is correct

Answer:

a) 125=5×5×5

so,3√125=5

3375=-3×-3×-3 × -5×-5×-5

so,3√-3375=-3×-5=15

so, cube root of 125×(-3375)

=3√125×3√-3375

=5×15=75

b) cube root of 45×75

45=3×3×5

75=3×5×5

45×75

=3×3×5 × 5×5×3

=3×3×3 × 5×5×5

=3375

so,3√3375=15

c) cube root of -140×2450

=-140=-2×-2×-5×-7

=2450=2×5×5×7×7

=-140×2450

=-2×-2×-5×-7 × 2×5×5×7×7

=-2×-2×2×-5×5×5×-7×7×7

=343000

so,3√343000=70