" 9's,then its cube el "

If a number ends in two 9's then its cube ends in __________number of 9's.

Prove that if a number is doubled, then its cube is eight times the cube of the given number.

Prove that if a number is tripled then its cube is 27 times the cube of the given number.

Prove that if a number is trebled then its cube is 27 xx the cube of the given number.

Prove that if a number is doubled,then its cube is eight xx the cube of the given number.

An edge of a variable cube is increasing at the rate of 2 cm//s . When the edge of a cube is 8 cm long, then its volume will increase at the rate of-

If the side of a cube is doubled then the change in its T.S.A. is

Use Euclid’s division lemma to show that the cube of any positive integer is of the form 9m, 9m + 1 or 9m + 8.