Each of the solutions of z^4 = 81 has a modulus of

is it 3?

The product of two negative rational numbers is always zero sometimes zero never zero

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Find the value of x. give reasons to justify your solutions! c ∈ ae