Let
. Then

lies in the second quadrant, so

So we have

and the fourth roots of
are

where
. In particular, they are




A) A triangle can have two congruent angles.
It's called an Isosceles Triangle
MrBillDoesMath!
Answer: The dependent variable depends on another variable for its value. For example, if y = 2x, setting x = 1 forces y= 2.; setting x = 10, forces y =20. There are no other possibilities for y once x ids chosen. So y is the dependent variable and x is the independent one. You can pick values for the independent variable (x) but no so for the dependent one.
MrB