Ben is 4 times as old as bill and is also 6 years older than bill. how old is ben?

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

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

Rationalize the denominator- 12x/√x-10