arrange the systems of equations that have a single solution in increasing order of the x-values in their solution

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Which of the following is a solution of z^6 = 64i? 2(cos105° + isin105°) 2(cos120° + isin120°) 2(cos135° + isin135°) 8(cos15° + isin15°)