1. 3 x 3 x 3 x 3
this is because it is to the power of 4 so you multiply 3 to itself 4 times (different than 3 x 4)
2. 18^4
because the 4th power is the exponent
3. 3 x 3 x 3 x 3
similar to question 1, this is called expanded form
4. four cubed
cubed is used to explain when 3 is the exponent, 2 as a exponent is squared